CVE-2024-44934

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What happens is:\n CPU 1 CPU 2\n start gc cycle remove port\n acquire gc lock first\n wait for lock\n call br_multicasg_gc() directly\n acquire lock now but free port\n the port can be freed\n while grp timers still\n running\n\nMake sure all previous gc cycles have finished by using flush_work before\nfreeing the port.\n\n[1]\n BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699\n\n CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024\n Call Trace:\n <IRQ>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792\n expire_timers kernel/time/timer.c:1843 [inline]\n __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417\n __run_timer_base kernel/time/timer.c:2428 [inline]\n __run_timer_base kernel/time/timer.c:2421 [inline]\n run_timer_base+0x111/0x190 kernel/time/timer.c:2437"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is entered only by removing a port from a bridge via local RTNL netlink (`ip link set dev X nomaster`) or the `SIOCBRDELIF` ioctl; received packets alone cannot trigger the port teardown. This requires local system access.\nAC:L - Although this is a race between the mcast gc workqueue and `br_multicast_del_port()`, the attacker drives both sides \u2014 populating/expiring port groups to queue gc work while concurrently deleting the port from another CPU \u2014 and can retry unboundedly, as demonstrated by the syzbot reproducer.\nPR:L - Bridge creation and port add/remove need only CAP_NET_ADMIN within a network namespace, which any unprivileged user obtains via `unshare -Urn` on default-configured distros; no real root is required.\nUI:N - The attacker performs every step \u2014 creating the bridge, generating multicast group state, and removing the port \u2014 with no action by any other user.\nS:U - The use-after-free is confined to kernel memory within the same security authority; it does not cross a VM, hypervisor, or IOMMU boundary.\nC:H - The expiring timer reads freed `net_bridge_port` memory (`pg->key.port->br`) and then dereferences that value as a bridge structure; controlling the reclaimed slab yields an arbitrary kernel read primitive and disclosure of kernel memory.\nI:H - After the port slab is reclaimed with attacker-controlled data, the callback performs `spin_lock(&br->multicast_lock)` and structured list/notify operations through the forged pointer, giving controlled kernel writes and a path to control-flow hijack.\nA:H - Even without exploitation the UAF causes a KASAN splat, oops, or panic when the group timer fires against the freed port, crashing the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bridge/br_multicast.c"], "versions": [{"version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "lessThan": "1e16828020c674b3be85f52685e8b80f9008f50f", "status": "affected", "versionType": "git"}, {"version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "lessThan": "0d8b26e10e680c01522d7cc14abe04c3265a928f", "status": "affected", "versionType": "git"}, {"version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "lessThan": "e3145ca904fa8dbfd1a5bf0187905bc117b0efce", "status": "affected", "versionType": "git"}, {"version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "lessThan": "b2f794b168cf560682ff976b255aa6d29d14a658", "status": "affected", "versionType": "git"}, {"version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "lessThan": "92c4ee25208d0f35dafc3213cdf355fbe449e078", "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_multicast.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.165", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.105", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.46", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.5", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11", "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": "5.10", "versionEndExcluding": "5.15.165"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.105"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.10.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f"}, {"url": "https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f"}, {"url": "https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce"}, {"url": "https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658"}, {"url": "https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078"}], "title": "net: bridge: mcast: wait for previous gc cycles when removing port", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-44934", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:27:51.533304Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:32:55.981Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:13:38.280Z"}}]}}

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What happens is:\n CPU 1 CPU 2\n start gc cycle remove port\n acquire gc lock first\n wait for lock\n call br_multicasg_gc() directly\n acquire lock now but free port\n the port can be freed\n while grp timers still\n running\n\nMake sure all previous gc cycles have finished by using flush_work before\nfreeing the port.\n\n[1]\n BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699\n\n CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024\n Call Trace:\n <IRQ>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792\n expire_timers kernel/time/timer.c:1843 [inline]\n __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417\n __run_timer_base kernel/time/timer.c:2428 [inline]\n __run_timer_base kernel/time/timer.c:2421 [inline]\n run_timer_base+0x111/0x190 kernel/time/timer.c:2437"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.165", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.105", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.46", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.5", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11", "versionStartIncluding": "5.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:32:17.983Z"}}}, "cveMetadata": {"cveId": "CVE-2024-44934", "state": "PUBLISHED", "dateUpdated": "2026-05-11T20:32:17.983Z", "dateReserved": "2024-08-21T05:34:56.664Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-08-26T10:11:25.809Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bridge/br_multicast.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1e16828020c674b3be85f52685e8b80f9008f50f", "status": "affected", "version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "versionType": "git"}, {"lessThan": "0d8b26e10e680c01522d7cc14abe04c3265a928f", "status": "affected", "version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "versionType": "git"}, {"lessThan": "e3145ca904fa8dbfd1a5bf0187905bc117b0efce", "status": "affected", "version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "versionType": "git"}, {"lessThan": "b2f794b168cf560682ff976b255aa6d29d14a658", "status": "affected", "version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "versionType": "git"}, {"lessThan": "92c4ee25208d0f35dafc3213cdf355fbe449e078", "status": "affected", "version": "e12cec65b5546f19217e26aafb8add6e2fadca18", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bridge/br_multicast.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"lessThan": "5.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.165", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.105", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.46", "versionType": "semver"}, {"lessThanOrEqual": "6.10.*", "status": "unaffected", "version": "6.10.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F3BF38C6-4F30-4588-B942-87545E62CA7D", "versionEndExcluding": "5.15.165", "versionStartIncluding": "5.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "89BEB24B-0F37-4C92-A397-564DA7CD8EE9", "versionEndExcluding": "6.1.105", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FA11941E-81FB-484C-B583-881EEB488340", "versionEndExcluding": "6.6.46", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D074AE50-4A5E-499C-A2FD-75FD60DEA560", "versionEndExcluding": "6.10.5", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*", "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*", "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mcast: wait for previous gc cycles when removing port\n\nsyzbot hit a use-after-free[1] which is caused because the bridge doesn't\nmake sure that all previous garbage has been collected when removing a\nport. What happens is:\n CPU 1 CPU 2\n start gc cycle remove port\n acquire gc lock first\n wait for lock\n call br_multicasg_gc() directly\n acquire lock now but free port\n the port can be freed\n while grp timers still\n running\n\nMake sure all previous gc cycles have finished by using flush_work before\nfreeing the port.\n\n[1]\n BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699\n\n CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024\n Call Trace:\n <IRQ>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792\n expire_timers kernel/time/timer.c:1843 [inline]\n __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417\n __run_timer_base kernel/time/timer.c:2428 [inline]\n __run_timer_base kernel/time/timer.c:2421 [inline]\n run_timer_base+0x111/0x190 kernel/time/timer.c:2437"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: bridge: mcast: espere los ciclos de gc anteriores al eliminar el puerto syzbot alcanz\u00f3 un use-after-free [1] que se debe a que el puente no se asegura de que todos Se ha recogido basura anterior al eliminar un puerto. Lo que sucede es: CPU 1 CPU 2 iniciar el ciclo de gc eliminar el puerto adquirir el bloqueo de gc primero esperar la llamada de bloqueo br_multicasg_gc() adquirir directamente el bloqueo ahora pero liberar el puerto el puerto se puede liberar mientras los temporizadores de grp a\u00fan se ejecutan Aseg\u00farese de que todos los ciclos de gc anteriores hayan finalizado usando flush_work antes de liberar el puerto. [1] ERROR: KASAN: slab-use-after-free en br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff888071d6d000 por tarea syz.5.1232/9699 CPU: 1 PID: 9699 Comm : syz.5.1232 No contaminado 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/06/2024 Seguimiento de llamadas: __dump_stack lib/dump_stack.c :88 [en l\u00ednea] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [en l\u00ednea] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm /kasan/report.c:601 br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861 call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [en l\u00ednea] __run_timers +0x74b/0xaf0 kernel/time/timer.c:2417 __run_timer_base kernel/time/timer.c:2428 [en l\u00ednea] __run_timer_base kernel/time/timer.c:2421 [en l\u00ednea] run_timer_base+0x111/0x190 kernel/time/timer. c:2437"}], "id": "CVE-2024-44934", "lastModified": "2026-08-04T11:20:00.677", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-44934", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:27:51.533304Z", "version": "2.0.3"}}]}, "published": "2024-08-26T11:15:05.593", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: net: bridge: mcast: wait for previous gc cycles when removing port", "id": "2307891", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2307891"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: bridge: mcast: wait for previous gc cycles when removing port\nsyzbot hit a use-after-free[1] which is caused because the bridge doesn't\nmake sure that all previous garbage has been collected when removing a\nport. What happens is:\nCPU 1 CPU 2\nstart gc cycle remove port\nacquire gc lock first\nwait for lock\ncall br_multicasg_gc() directly\nacquire lock now but free port\nthe port can be freed\nwhile grp timers still\nrunning\nMake sure all previous gc cycles have finished by using flush_work before\nfreeing the port.\n[1]\nBUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\nRead of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699\nCPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024\nCall Trace:\n<IRQ>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\nprint_address_description mm/kasan/report.c:377 [inline]\nprint_report+0xc3/0x620 mm/kasan/report.c:488\nkasan_report+0xd9/0x110 mm/kasan/report.c:601\nbr_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\ncall_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792\nexpire_timers kernel/time/timer.c:1843 [inline]\n__run_timers+0x74b/0xaf0 kernel/time/timer.c:2417\n__run_timer_base kernel/time/timer.c:2428 [inline]\n__run_timer_base kernel/time/timer.c:2421 [inline]\nrun_timer_base+0x111/0x190 kernel/time/timer.c:2437"], "name": "CVE-2024-44934", "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:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-08-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-44934\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-44934\nhttps://lore.kernel.org/linux-cve-announce/2024082641-CVE-2024-44934-a7fe@gregkh/T"], "threat_severity": "Moderate"}

{}