{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-47711", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-30T16:00:12.948Z", "datePublished": "2024-10-21T11:53:44.102Z", "dateUpdated": "2024-11-05T09:49:15.744Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-05T09:49:15.744Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Don't return OOB skb in manage_oob().\n\nsyzbot reported use-after-free in unix_stream_recv_urg(). [0]\n\nThe scenario is\n\n 1. send(MSG_OOB)\n 2. recv(MSG_OOB)\n -> The consumed OOB remains in recv queue\n 3. send(MSG_OOB)\n 4. recv()\n -> manage_oob() returns the next skb of the consumed OOB\n -> This is also OOB, but unix_sk(sk)->oob_skb is not cleared\n 5. recv(MSG_OOB)\n -> unix_sk(sk)->oob_skb is used but already freed\n\nThe recent commit 8594d9b85c07 (\"af_unix: Don't call skb_get() for OOB\nskb.\") uncovered the issue.\n\nIf the OOB skb is consumed and the next skb is peeked in manage_oob(),\nwe still need to check if the skb is OOB.\n\nLet's do so by falling back to the following checks in manage_oob()\nand add the test case in selftest.\n\nNote that we need to add a similar check for SIOCATMARK.\n\n[0]:\nBUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\nRead of size 4 at addr ffff8880326abcc4 by task syz-executor178/5235\n\nCPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:93 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\n unix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640\n unix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778\n unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996\n sock_recvmsg_nosec net/socket.c:1046 [inline]\n sock_recvmsg+0x22f/0x280 net/socket.c:1068\n ____sys_recvmsg+0x1db/0x470 net/socket.c:2816\n ___sys_recvmsg net/socket.c:2858 [inline]\n __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f5360d6b4e9\nCode: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f\nRAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9\nRDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003\nRBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001\nR13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001\n </TASK>\n\nAllocated by task 5235:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n unpoison_slab_object mm/kasan/common.c:312 [inline]\n __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338\n kasan_slab_alloc include/linux/kasan.h:201 [inline]\n slab_post_alloc_hook mm/slub.c:3988 [inline]\n slab_alloc_node mm/slub.c:4037 [inline]\n kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080\n __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667\n alloc_skb include/linux/skbuff.h:1320 [inline]\n alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528\n sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815\n sock_alloc_send_skb include/net/sock.h:1778 [inline]\n queue_oob+0x108/0x680 net/unix/af_unix.c:2198\n unix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597\n ___sys_sendmsg net/socket.c:2651 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 5235:\n kasan_save_stack mm/kasan/common.c:47\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/unix/af_unix.c", "tools/testing/selftests/net/af_unix/msg_oob.c"], "versions": [{"version": "93c99f21db36", "lessThan": "4a7f9a2591a9", "status": "affected", "versionType": "git"}, {"version": "93c99f21db36", "lessThan": "5aa57d9f2d53", "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/unix/af_unix.c", "tools/testing/selftests/net/af_unix/msg_oob.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.2", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/4a7f9a2591a923bdde4bd7eac33490b6ae3b257c"}, {"url": "https://git.kernel.org/stable/c/5aa57d9f2d5311f19434d95b2a81610aa263e23b"}], "title": "af_unix: Don't return OOB skb in manage_oob().", "x_generator": {"engine": "bippy-9e1c9544281a"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-47711", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-21T13:03:14.686039Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:04:18.955Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-47711", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-21T13:03:14.686039Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:03:17.827Z"}}], "cna": {"title": "af_unix: Don't return OOB skb in manage_oob().", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "93c99f21db36", "lessThan": "4a7f9a2591a9", "versionType": "git"}, {"status": "affected", "version": "93c99f21db36", "lessThan": "5aa57d9f2d53", "versionType": "git"}], "programFiles": ["net/unix/af_unix.c", "tools/testing/selftests/net/af_unix/msg_oob.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"status": "unaffected", "version": "0", "lessThan": "6.10", "versionType": "custom"}, {"status": "unaffected", "version": "6.11.2", "versionType": "custom", "lessThanOrEqual": "6.11.*"}, {"status": "unaffected", "version": "6.12-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/unix/af_unix.c", "tools/testing/selftests/net/af_unix/msg_oob.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4a7f9a2591a923bdde4bd7eac33490b6ae3b257c"}, {"url": "https://git.kernel.org/stable/c/5aa57d9f2d5311f19434d95b2a81610aa263e23b"}], "x_generator": {"engine": "bippy-c9c4e1df01b2"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Don't return OOB skb in manage_oob().\n\nsyzbot reported use-after-free in unix_stream_recv_urg(). [0]\n\nThe scenario is\n\n 1. send(MSG_OOB)\n 2. recv(MSG_OOB)\n -> The consumed OOB remains in recv queue\n 3. send(MSG_OOB)\n 4. recv()\n -> manage_oob() returns the next skb of the consumed OOB\n -> This is also OOB, but unix_sk(sk)->oob_skb is not cleared\n 5. recv(MSG_OOB)\n -> unix_sk(sk)->oob_skb is used but already freed\n\nThe recent commit 8594d9b85c07 (\"af_unix: Don't call skb_get() for OOB\nskb.\") uncovered the issue.\n\nIf the OOB skb is consumed and the next skb is peeked in manage_oob(),\nwe still need to check if the skb is OOB.\n\nLet's do so by falling back to the following checks in manage_oob()\nand add the test case in selftest.\n\nNote that we need to add a similar check for SIOCATMARK.\n\n[0]:\nBUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\nRead of size 4 at addr ffff8880326abcc4 by task syz-executor178/5235\n\nCPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:93 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\n unix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640\n unix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778\n unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996\n sock_recvmsg_nosec net/socket.c:1046 [inline]\n sock_recvmsg+0x22f/0x280 net/socket.c:1068\n ____sys_recvmsg+0x1db/0x470 net/socket.c:2816\n ___sys_recvmsg net/socket.c:2858 [inline]\n __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f5360d6b4e9\nCode: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f\nRAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9\nRDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003\nRBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001\nR13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001\n </TASK>\n\nAllocated by task 5235:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n unpoison_slab_object mm/kasan/common.c:312 [inline]\n __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338\n kasan_slab_alloc include/linux/kasan.h:201 [inline]\n slab_post_alloc_hook mm/slub.c:3988 [inline]\n slab_alloc_node mm/slub.c:4037 [inline]\n kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080\n __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667\n alloc_skb include/linux/skbuff.h:1320 [inline]\n alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528\n sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815\n sock_alloc_send_skb include/net/sock.h:1778 [inline]\n queue_oob+0x108/0x680 net/unix/af_unix.c:2198\n unix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597\n ___sys_sendmsg net/socket.c:2651 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 5235:\n kasan_save_stack mm/kasan/common.c:47\n---truncated---"}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-10-21T11:53:44.102Z"}}}, "cveMetadata": {"cveId": "CVE-2024-47711", "state": "PUBLISHED", "dateUpdated": "2024-10-21T13:04:18.955Z", "dateReserved": "2024-09-30T16:00:12.948Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-10-21T11:53:44.102Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7CD11465-AFC4-428F-A933-C8F6486DDC2F", "versionEndExcluding": "6.10", "versionStartIncluding": "6.9.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "634B10CE-0F2B-4C13-B5F9-5F2559F2369D", "versionEndExcluding": "6.11.2", "versionStartIncluding": "6.10", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Don't return OOB skb in manage_oob().\n\nsyzbot reported use-after-free in unix_stream_recv_urg(). [0]\n\nThe scenario is\n\n 1. send(MSG_OOB)\n 2. recv(MSG_OOB)\n -> The consumed OOB remains in recv queue\n 3. send(MSG_OOB)\n 4. recv()\n -> manage_oob() returns the next skb of the consumed OOB\n -> This is also OOB, but unix_sk(sk)->oob_skb is not cleared\n 5. recv(MSG_OOB)\n -> unix_sk(sk)->oob_skb is used but already freed\n\nThe recent commit 8594d9b85c07 (\"af_unix: Don't call skb_get() for OOB\nskb.\") uncovered the issue.\n\nIf the OOB skb is consumed and the next skb is peeked in manage_oob(),\nwe still need to check if the skb is OOB.\n\nLet's do so by falling back to the following checks in manage_oob()\nand add the test case in selftest.\n\nNote that we need to add a similar check for SIOCATMARK.\n\n[0]:\nBUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\nRead of size 4 at addr ffff8880326abcc4 by task syz-executor178/5235\n\nCPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:93 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x169/0x550 mm/kasan/report.c:488\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\n unix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640\n unix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778\n unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996\n sock_recvmsg_nosec net/socket.c:1046 [inline]\n sock_recvmsg+0x22f/0x280 net/socket.c:1068\n ____sys_recvmsg+0x1db/0x470 net/socket.c:2816\n ___sys_recvmsg net/socket.c:2858 [inline]\n __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f5360d6b4e9\nCode: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f\nRAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9\nRDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003\nRBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001\nR13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001\n </TASK>\n\nAllocated by task 5235:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n unpoison_slab_object mm/kasan/common.c:312 [inline]\n __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338\n kasan_slab_alloc include/linux/kasan.h:201 [inline]\n slab_post_alloc_hook mm/slub.c:3988 [inline]\n slab_alloc_node mm/slub.c:4037 [inline]\n kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080\n __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667\n alloc_skb include/linux/skbuff.h:1320 [inline]\n alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528\n sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815\n sock_alloc_send_skb include/net/sock.h:1778 [inline]\n queue_oob+0x108/0x680 net/unix/af_unix.c:2198\n unix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597\n ___sys_sendmsg net/socket.c:2651 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 5235:\n kasan_save_stack mm/kasan/common.c:47\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: af_unix: No devuelva skb OOB en manage_oob(). syzbot inform\u00f3 de un error de use after free en unix_stream_recv_urg(). [0] El escenario es 1. send(MSG_OOB) 2. recv(MSG_OOB) -&gt; El OOB consumido permanece en la cola de recepci\u00f3n 3. send(MSG_OOB) 4. recv() -&gt; manage_oob() devuelve el siguiente skb del OOB consumido -&gt; Este tambi\u00e9n es OOB, pero unix_sk(sk)-&gt;oob_skb no se borra 5. recv(MSG_OOB) -&gt; unix_sk(sk)-&gt;oob_skb se usa pero ya se liber\u00f3 La reciente confirmaci\u00f3n 8594d9b85c07 (\"af_unix: No llame a skb_get() para skb OOB\") descubri\u00f3 el problema. Si se consume el skb OOB y se examina el siguiente skb en manage_oob(), a\u00fan necesitamos verificar si el skb es OOB. Hag\u00e1moslo recurriendo a las siguientes verificaciones en manage_oob() y agregando el caso de prueba en selftest. Tenga en cuenta que necesitamos agregar una verificaci\u00f3n similar para SIOCATMARK. [0]: ERROR: KASAN: slab-use-after-free en unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff8880326abcc4 por la tarea syz-executor178/5235 CPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 No contaminado 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:93 [en l\u00ednea] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 descripci\u00f3n de la direcci\u00f3n de impresi\u00f3n mm/kasan/report.c:377 [en l\u00ednea] informe de impresi\u00f3n+0x169/0x550 mm/kasan/report.c:488 informe de kasan+0x143/0x180 mm/kasan/report.c:601 unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959 unix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640 unix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778 unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996 sock_recvmsg_nosec red/socket.c:1046 [en l\u00ednea] sock_recvmsg+0x22f/0x280 red/socket.c:1068 ____sys_recvmsg+0x1db/0x470 red/socket.c:2816 ___sys_recvmsg red/socket.c:2858 [en l\u00ednea] __sys_recvmsg+0x2f0/0x3e0 red/socket.c:2888 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f DESCARGA: 0033:0x7f5360d6b4e9 C\u00f3digo: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 &lt;48&gt; 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9 RDX: 0000000000002001 RSI: 0000000020000640 RDI: 000000000 0000003 RBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000000001 R13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001 Asignado por la tarea 5235: kasan_save_stack mm/kasan/common.c:47 [en l\u00ednea] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [en l\u00ednea] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [en l\u00ednea] slab_post_alloc_hook mm/slub.c:3988 [en l\u00ednea] slab_alloc_node mm/slub.c:4037 [en l\u00ednea] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667 alloc_skb include/linux/skbuff.h:1320 [en l\u00ednea] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815 sock_alloc_send_skb include/net/sock.h:1778 [en l\u00ednea] queue_oob+0x108/0x680 net/unix/af_unix.c:2198 unix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351 sock_sendmsg_nosec net/socket.c:730 [en l\u00ednea] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 ___sys_sendmsg net/socket.c:2651 [en l\u00ednea] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Liberado por la tarea ---truncado---"}], "id": "CVE-2024-47711", "lastModified": "2024-10-24T14:03:24.700", "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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-10-21T12:15:07.563", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4a7f9a2591a923bdde4bd7eac33490b6ae3b257c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5aa57d9f2d5311f19434d95b2a81610aa263e23b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: af_unix: Don&#39;t return OOB skb in manage_oob().", "id": "2320182", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320182"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\naf_unix: Don't return OOB skb in manage_oob().\nsyzbot reported use-after-free in unix_stream_recv_urg(). [0]\nThe scenario is\n1. send(MSG_OOB)\n2. recv(MSG_OOB)\n-> The consumed OOB remains in recv queue\n3. send(MSG_OOB)\n4. recv()\n-> manage_oob() returns the next skb of the consumed OOB\n-> This is also OOB, but unix_sk(sk)->oob_skb is not cleared\n5. recv(MSG_OOB)\n-> unix_sk(sk)->oob_skb is used but already freed\nThe recent commit 8594d9b85c07 (\"af_unix: Don't call skb_get() for OOB\nskb.\") uncovered the issue.\nIf the OOB skb is consumed and the next skb is peeked in manage_oob(),\nwe still need to check if the skb is OOB.\nLet's do so by falling back to the following checks in manage_oob()\nand add the test case in selftest.\nNote that we need to add a similar check for SIOCATMARK.\n[0]:\nBUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\nRead of size 4 at addr ffff8880326abcc4 by task syz-executor178/5235\nCPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:93 [inline]\ndump_stack_lvl+0x241/0x360 lib/dump_stack.c:119\nprint_address_description mm/kasan/report.c:377 [inline]\nprint_report+0x169/0x550 mm/kasan/report.c:488\nkasan_report+0x143/0x180 mm/kasan/report.c:601\nunix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959\nunix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640\nunix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778\nunix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996\nsock_recvmsg_nosec net/socket.c:1046 [inline]\nsock_recvmsg+0x22f/0x280 net/socket.c:1068\n____sys_recvmsg+0x1db/0x470 net/socket.c:2816\n___sys_recvmsg net/socket.c:2858 [inline]\n__sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f5360d6b4e9\nCode: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f\nRAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9\nRDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003\nRBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001\nR13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001\n</TASK>\nAllocated by task 5235:\nkasan_save_stack mm/kasan/common.c:47 [inline]\nkasan_save_track+0x3f/0x80 mm/kasan/common.c:68\nunpoison_slab_object mm/kasan/common.c:312 [inline]\n__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338\nkasan_slab_alloc include/linux/kasan.h:201 [inline]\nslab_post_alloc_hook mm/slub.c:3988 [inline]\nslab_alloc_node mm/slub.c:4037 [inline]\nkmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080\n__alloc_skb+0x1c3/0x440 net/core/skbuff.c:667\nalloc_skb include/linux/skbuff.h:1320 [inline]\nalloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528\nsock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815\nsock_alloc_send_skb include/net/sock.h:1778 [inline]\nqueue_oob+0x108/0x680 net/unix/af_unix.c:2198\nunix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351\nsock_sendmsg_nosec net/socket.c:730 [inline]\n__sock_sendmsg+0x221/0x270 net/socket.c:745\n____sys_sendmsg+0x525/0x7d0 net/socket.c:2597\n___sys_sendmsg net/socket.c:2651 [inline]\n__sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nFreed by task 5235:\nkasan_save_stack mm/kasan/common.c:47\n---truncated---"], "name": "CVE-2024-47711", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-47711\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-47711\nhttps://lore.kernel.org/linux-cve-announce/2024102118-CVE-2024-47711-349d@gregkh/T"], "threat_severity": "Moderate"}