CVE-2024-38538

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-38538", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-18T19:36:34.918Z", "datePublished": "2024-06-19T13:35:13.384Z", "dateUpdated": "2026-08-05T11:32:37.537Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:32:37.537Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: xmit: make sure we have at least eth header len bytes\n\nsyzbot triggered an uninit value[1] error in bridge device's xmit path\nby sending a short (less than ETH_HLEN bytes) skb. To fix it check if\nwe can actually pull that amount instead of assuming.\n\nTested with dropwatch:\n drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3)\n origin: software\n timestamp: Mon May 13 11:31:53 2024 778214037 nsec\n protocol: 0x88a8\n length: 2\n original length: 2\n drop reason: PKT_TOO_SMALL\n\n[1]\nBUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\n netdev_start_xmit include/linux/netdevice.h:4917 [inline]\n xmit_one net/core/dev.c:3531 [inline]\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n __dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341\n dev_queue_xmit include/linux/netdevice.h:3091 [inline]\n __bpf_tx_skb net/core/filter.c:2136 [inline]\n __bpf_redirect_common net/core/filter.c:2180 [inline]\n __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187\n ____bpf_clone_redirect net/core/filter.c:2460 [inline]\n bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432\n ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\n __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238\n bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]\n __bpf_prog_run include/linux/filter.h:657 [inline]\n bpf_prog_run include/linux/filter.h:664 [inline]\n bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425\n bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058\n bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678\n __do_sys_bpf kernel/bpf/syscall.c:5767 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5765 [inline]\n __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765\n x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - `br_dev_xmit()` is the bridge device's locally-originated transmit path \u2014 remotely received frames go through `br_handle_frame`/`br_forward` and always carry a full Ethernet header, and IP routing toward a bridge always builds one via `dev_hard_header()`. Triggering it requires local injection of a sub-14-byte skb (tun write or AF_PACKET on a `hard_header_len == 0` device, plus a tc `mirred` redirect).\nAC:L - The attacker fully and deterministically controls the skb length; there is no race, no timing window, and no dependence on memory layout or victim state. Every attempt reaches the uninitialized read and the subsequent `skb_push()` leak.\nPR:L - The setup needs CAP_NET_ADMIN/CAP_NET_RAW only within a network namespace, which any unprivileged user obtains via `unshare -Urn` (create the bridge, create the tun/tunnel device, attach the tc mirred redirect, and capture leaked frames from a veth peer). No real root in the initial namespace is required.\nUI:N - The attacker performs every step \u2014 creating the devices, writing the short frame, and reading the leaked frames back \u2014 with no action by any other user or administrator.\nS:U - The uninitialized read, the malformed skb, and the resulting disclosure all stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to 14 bytes of uninitialized kernel heap (skb headroom and the region past `skb->tail`, which routinely holds freed packet data and kernel values) are read and then, via the unconditional `skb_push(skb, ETH_HLEN)` in `br_dev_queue_push_xmit()`, transmitted verbatim out every bridge port where the attacker captures them. The leak is repeatable at packet rate, yielding an effectively unbounded kernel memory disclosure rather than a bounded few-byte read.\nI:L - There is no out-of-bounds write primitive, but the kernel emits malformed frames whose source/destination MAC addresses are uninitialized memory, and forwarding decisions (broadcast/multicast/unicast, FDB lookup) are made on that garbage \u2014 corrupting local and peer bridge/switch forwarding state in a limited, attacker-influenced way.\nA:H - When the short skb has less than ETH_HLEN of headroom (as in the syzbot BPF-redirect reproducer), `skb_push(skb, ETH_HLEN)` in `br_dev_queue_push_xmit()` drives `skb->data` below `skb->head` and hits `skb_under_panic()` \u2192 `BUG()`, a hard kernel panic. Additionally the resulting skb has `mac_header`/`network_header` desynchronized from `skb->data`, propagating a malformed skb into the generic xmit path (e.g. the `WARN_ONCE` in `skb_checksum_help()`, fatal under `panic_on_warn`), and the trigger can be repeated indefinitely."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bridge/br_device.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3e01fc3c66e65d9afe98f1489047a1b2dd8741ca", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b2b7c43cd32080221bb233741bd6011983fe7c11", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "82090f94c723dab724b1c32db406091d40448a17", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c964429ef53f42098a6545a5dabeb1441c1e821d", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "28126b83f86ab9cc7936029c2dff845d3dcedba2", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "1abb371147905ba250b4cc0230c4be7e90bea4d5", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f482fd4ce919836a49012b2d31b00fc36e2488f2", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "5b5d669f569807c7ab07546e73c0741845a2547a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afc", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bridge/br_device.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.324", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.286", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.230", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.172", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8.12", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.3", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.19.324"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.4.286"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.230"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.172"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.8.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.9.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3e01fc3c66e65d9afe98f1489047a1b2dd8741ca"}, {"url": "https://git.kernel.org/stable/c/b2b7c43cd32080221bb233741bd6011983fe7c11"}, {"url": "https://git.kernel.org/stable/c/82090f94c723dab724b1c32db406091d40448a17"}, {"url": "https://git.kernel.org/stable/c/c964429ef53f42098a6545a5dabeb1441c1e821d"}, {"url": 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"semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9.3", "versionType": "semver", "lessThanOrEqual": "6.9.*"}, {"status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bridge/br_device.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/3e01fc3c66e65d9afe98f1489047a1b2dd8741ca"}, {"url": "https://git.kernel.org/stable/c/b2b7c43cd32080221bb233741bd6011983fe7c11"}, {"url": "https://git.kernel.org/stable/c/82090f94c723dab724b1c32db406091d40448a17"}, {"url": "https://git.kernel.org/stable/c/c964429ef53f42098a6545a5dabeb1441c1e821d"}, {"url": "https://git.kernel.org/stable/c/28126b83f86ab9cc7936029c2dff845d3dcedba2"}, {"url": "https://git.kernel.org/stable/c/1abb371147905ba250b4cc0230c4be7e90bea4d5"}, {"url": "https://git.kernel.org/stable/c/f482fd4ce919836a49012b2d31b00fc36e2488f2"}, {"url": "https://git.kernel.org/stable/c/5b5d669f569807c7ab07546e73c0741845a2547a"}, {"url": "https://git.kernel.org/stable/c/8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afc"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: xmit: make sure we have at least eth header len bytes\n\nsyzbot triggered an uninit value[1] error in bridge device's xmit path\nby sending a short (less than ETH_HLEN bytes) skb. To fix it check if\nwe can actually pull that amount instead of assuming.\n\nTested with dropwatch:\n drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3)\n origin: software\n timestamp: Mon May 13 11:31:53 2024 778214037 nsec\n protocol: 0x88a8\n length: 2\n original length: 2\n drop reason: PKT_TOO_SMALL\n\n[1]\nBUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\n netdev_start_xmit include/linux/netdevice.h:4917 [inline]\n xmit_one net/core/dev.c:3531 [inline]\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n __dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341\n dev_queue_xmit include/linux/netdevice.h:3091 [inline]\n __bpf_tx_skb net/core/filter.c:2136 [inline]\n __bpf_redirect_common net/core/filter.c:2180 [inline]\n __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187\n ____bpf_clone_redirect net/core/filter.c:2460 [inline]\n bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432\n ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\n __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238\n bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]\n __bpf_prog_run include/linux/filter.h:657 [inline]\n bpf_prog_run include/linux/filter.h:664 [inline]\n bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425\n bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058\n bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678\n __do_sys_bpf kernel/bpf/syscall.c:5767 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5765 [inline]\n __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765\n x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.324", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.286", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.230", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.172", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.93", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.33", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.12", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9.3", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10", "versionStartIncluding": "2.6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:18:36.672Z"}}}, "cveMetadata": {"cveId": "CVE-2024-38538", "state": "PUBLISHED", "dateUpdated": "2026-05-11T20:18:36.672Z", "dateReserved": "2024-06-18T19:36:34.918Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-06-19T13:35:13.384Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bridge/br_device.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3e01fc3c66e65d9afe98f1489047a1b2dd8741ca", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "b2b7c43cd32080221bb233741bd6011983fe7c11", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "82090f94c723dab724b1c32db406091d40448a17", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "c964429ef53f42098a6545a5dabeb1441c1e821d", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "28126b83f86ab9cc7936029c2dff845d3dcedba2", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "1abb371147905ba250b4cc0230c4be7e90bea4d5", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "f482fd4ce919836a49012b2d31b00fc36e2488f2", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "5b5d669f569807c7ab07546e73c0741845a2547a", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afc", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bridge/br_device.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"lessThan": "2.6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.324", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.286", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.230", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.172", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.93", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.33", "versionType": "semver"}, {"lessThanOrEqual": "6.8.*", "status": "unaffected", "version": "6.8.12", "versionType": "semver"}, {"lessThanOrEqual": "6.9.*", "status": "unaffected", "version": "6.9.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.10", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A0CD5542-EADA-49C4-B859-AC21A3303899", "versionEndExcluding": "6.1.93", "versionStartIncluding": "2.6.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FCE796DF-3B50-4DC6-BAE5-95271068FC9E", "versionEndExcluding": "6.6.33", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "80550309-67AB-4FD1-AC07-3DED5C4F01B2", "versionEndExcluding": "6.8.12", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E07124C1-19E8-4D21-828D-9932A01D3011", "versionEndExcluding": "6.9.3", "versionStartIncluding": "6.9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: xmit: make sure we have at least eth header len bytes\n\nsyzbot triggered an uninit value[1] error in bridge device's xmit path\nby sending a short (less than ETH_HLEN bytes) skb. To fix it check if\nwe can actually pull that amount instead of assuming.\n\nTested with dropwatch:\n drop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3)\n origin: software\n timestamp: Mon May 13 11:31:53 2024 778214037 nsec\n protocol: 0x88a8\n length: 2\n original length: 2\n drop reason: PKT_TOO_SMALL\n\n[1]\nBUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\n netdev_start_xmit include/linux/netdevice.h:4917 [inline]\n xmit_one net/core/dev.c:3531 [inline]\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n __dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341\n dev_queue_xmit include/linux/netdevice.h:3091 [inline]\n __bpf_tx_skb net/core/filter.c:2136 [inline]\n __bpf_redirect_common net/core/filter.c:2180 [inline]\n __bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187\n ____bpf_clone_redirect net/core/filter.c:2460 [inline]\n bpf_clone_redirect+0x328/0x470 net/core/filter.c:2432\n ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\n __bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238\n bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]\n __bpf_prog_run include/linux/filter.h:657 [inline]\n bpf_prog_run include/linux/filter.h:664 [inline]\n bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425\n bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058\n bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678\n __do_sys_bpf kernel/bpf/syscall.c:5767 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5765 [inline]\n __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765\n x64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: bridge: xmit: aseg\u00farese de tener al menos el encabezado eth len bytes syzbot desencaden\u00f3 un error de valor uninit[1] en la ruta xmit del dispositivo puente al enviar un mensaje corto (menos de ETH_HLEN bytes) skb. Para solucionarlo, compruebe si realmente podemos retirar esa cantidad en lugar de suponerla. Probado con dropwatch: soltar en: br_dev_xmit+0xb93/0x12d0 [puente] (0xffffffffc06739b3) origen: marca de tiempo del software: lunes 13 de mayo 11:31:53 2024 778214037 protocolo nsec: 0x88a8 longitud: 2 longitud original: 2 motivo de ca\u00edda: PKT_TOO_SMALL [1 ] ERROR: KMSAN: valor uninit en br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65 br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65 __netdev_start_xmit include/linux/netdevice.h:4903 [en l\u00ednea] netdev_start_xmit include/linux/netdevice.h:4917 [en l\u00ednea] xmit_one net/core/dev.c:3531 [en l\u00ednea] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547 __dev_queue_xmit+0x34db/0x5350 net/core/dev .c:4341 dev_queue_xmit include/linux/netdevice.h:3091 [en l\u00ednea] __bpf_tx_skb net/core/filter.c:2136 [en l\u00ednea] __bpf_redirect_common net/core/filter.c:2180 [en l\u00ednea] __bpf_redirect+0x14a6/0x1620 net/ Core/Filter.C: 2187 ____BPF_CLONE_REDIRECT NET/CORE/FILTRO.C: 2460 [Inline] BPF_CLONE_REDIRECT+0x328/0x470 NET/Core/Filter.c: 2432 ___ BPF_PROG_RUN+0X13FE/0XE0F0 KERNEL/BPF/BPF/CORE. 0xb5/0xe0 kernel/bpf/core.c:2238 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [en l\u00ednea] __bpf_prog_run include/linux/filter.h:657 [en l\u00ednea] bpf_prog_run include/linux/filter.h:664 [en l\u00ednea ] bpf_test_run+0x499/0xc30 net/bpf/test_run.c:425 bpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058 bpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269 pf+0x6aa/0xd90 n\u00facleo/ bpf/syscall.c:5678 __do_sys_bpf kernel/bpf/syscall.c:5767 [en l\u00ednea] __se_sys_bpf kernel/bpf/syscall.c:5765 [en l\u00ednea] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765 ys_call+0x96b /0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 Entry_SYSCALL_64_after_hwframe+ 0x77/0x7f"}], "id": "CVE-2024-38538", "lastModified": "2026-08-04T11:18:41.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-38538", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:15:16.575973Z", "version": "2.0.3"}}]}, "published": "2024-06-19T14:15:14.107", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1abb371147905ba250b4cc0230c4be7e90bea4d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28126b83f86ab9cc7936029c2dff845d3dcedba2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3e01fc3c66e65d9afe98f1489047a1b2dd8741ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b5d669f569807c7ab07546e73c0741845a2547a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/82090f94c723dab724b1c32db406091d40448a17"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2b7c43cd32080221bb233741bd6011983fe7c11"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c964429ef53f42098a6545a5dabeb1441c1e821d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f482fd4ce919836a49012b2d31b00fc36e2488f2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1abb371147905ba250b4cc0230c4be7e90bea4d5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28126b83f86ab9cc7936029c2dff845d3dcedba2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b5d669f569807c7ab07546e73c0741845a2547a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8bd67ebb50c0145fd2ca8681ab65eb7e8cde1afc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f482fd4ce919836a49012b2d31b00fc36e2488f2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:5102", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.16.1.rt7.357.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-08-08T00:00:00Z"}, {"advisory": "RHSA-2024:5101", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.16.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-08-08T00:00:00Z"}, {"advisory": "RHSA-2024:5255", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.67.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-08-13T00:00:00Z"}, {"advisory": "RHSA-2024:5928", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.33.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-08-28T00:00:00Z"}, {"advisory": "RHSA-2024:5928", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.33.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-08-28T00:00:00Z"}, {"advisory": "RHSA-2024:5364", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.79.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-08-14T00:00:00Z"}, {"advisory": "RHSA-2024:5365", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.79.1.rt14.364.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-08-14T00:00:00Z"}], "bugzilla": {"description": "kernel: net: bridge: xmit: make sure we have at least eth header len bytes", "id": "2293461", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293461"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "verified"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: bridge: xmit: make sure we have at least eth header len bytes\nsyzbot triggered an uninit value[1] error in bridge device's xmit path\nby sending a short (less than ETH_HLEN bytes) skb. To fix it check if\nwe can actually pull that amount instead of assuming.\nTested with dropwatch:\ndrop at: br_dev_xmit+0xb93/0x12d0 [bridge] (0xffffffffc06739b3)\norigin: software\ntimestamp: Mon May 13 11:31:53 2024 778214037 nsec\nprotocol: 0x88a8\nlength: 2\noriginal length: 2\ndrop reason: PKT_TOO_SMALL\n[1]\nBUG: KMSAN: uninit-value in br_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\nbr_dev_xmit+0x61d/0x1cb0 net/bridge/br_device.c:65\n__netdev_start_xmit include/linux/netdevice.h:4903 [inline]\nnetdev_start_xmit include/linux/netdevice.h:4917 [inline]\nxmit_one net/core/dev.c:3531 [inline]\ndev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n__dev_queue_xmit+0x34db/0x5350 net/core/dev.c:4341\ndev_queue_xmit include/linux/netdevice.h:3091 [inline]\n__bpf_tx_skb net/core/filter.c:2136 [inline]\n__bpf_redirect_common net/core/filter.c:2180 [inline]\n__bpf_redirect+0x14a6/0x1620 net/core/filter.c:2187\n____bpf_clone_redirect net/core/filter.c:2460 [inline]\nbpf_clone_redirect+0x328/0x470 net/core/filter.c:2432\n___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\n__bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2238\nbpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]\n__bpf_prog_run include/linux/filter.h:657 [inline]\nbpf_prog_run include/linux/filter.h:664 [inline]\nbpf_test_run+0x499/0xc30 net/bpf/test_run.c:425\nbpf_prog_test_run_skb+0x14ea/0x1f20 net/bpf/test_run.c:1058\nbpf_prog_test_run+0x6b7/0xad0 kernel/bpf/syscall.c:4269\n__sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5678\n__do_sys_bpf kernel/bpf/syscall.c:5767 [inline]\n__se_sys_bpf kernel/bpf/syscall.c:5765 [inline]\n__x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5765\nx64_sys_call+0x96b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:322\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f"], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-38538", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-38538\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-38538\nhttps://lore.kernel.org/linux-cve-announce/2024061947-CVE-2024-38538-e28a@gregkh/T"], "statement": "This vulnerability in is classified as moderate severity because it requires local access and specific packet manipulation to exploit. While it may impact system stability, it does not broadly compromise system security, as its effects remain limited to certain packet-handling scenarios.", "threat_severity": "Moderate"}

{}