CVE-2024-26676
Vulnerability from cvelistv5
Published
2024-04-02 07:01
Modified
2024-11-05 17:59
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
af_unix: Call kfree_skb() for dead unix_(sk)->oob_skb in GC.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1279f9d9dec2d7462823a18c29ad61359e0a007d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4fe505c63aa3273135a57597fda761e9aecc7668
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82ae47c5c3a6b27fdc0f9e83c1499cb439c56140
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b74aa9ce13d02b7fd37c5325b99854f91b9b4276
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0e09186d8821ad59806115d347ea32efa43ca4b
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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              "attackVector": "LOCAL",
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              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
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              "content": {
                "id": "CVE-2024-26676",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-04-02T15:25:42.881633Z",
                "version": "2.0.3"
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              "type": "ssvc"
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                "type": "CWE"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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          "dateUpdated": "2024-08-02T00:14:12.513Z",
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
          "versions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Call kfree_skb() for dead unix_(sk)-\u003eoob_skb in GC.\n\nsyzbot reported a warning [0] in __unix_gc() with a repro, which\ncreates a socketpair and sends one socket\u0027s fd to itself using the\npeer.\n\n  socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0\n  sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=\"\\360\", iov_len=1}],\n          msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET,\n                                      cmsg_type=SCM_RIGHTS, cmsg_data=[3]}],\n          msg_controllen=24, msg_flags=0}, MSG_OOB|MSG_PROBE|MSG_DONTWAIT|MSG_ZEROCOPY) = 1\n\nThis forms a self-cyclic reference that GC should finally untangle\nbut does not due to lack of MSG_OOB handling, resulting in memory\nleak.\n\nRecently, commit 11498715f266 (\"af_unix: Remove io_uring code for\nGC.\") removed io_uring\u0027s dead code in GC and revealed the problem.\n\nThe code was executed at the final stage of GC and unconditionally\nmoved all GC candidates from gc_candidates to gc_inflight_list.\nThat papered over the reported problem by always making the following\nWARN_ON_ONCE(!list_empty(\u0026gc_candidates)) false.\n\nThe problem has been there since commit 2aab4b969002 (\"af_unix: fix\nstruct pid leaks in OOB support\") added full scm support for MSG_OOB\nwhile fixing another bug.\n\nTo fix this problem, we must call kfree_skb() for unix_sk(sk)-\u003eoob_skb\nif the socket still exists in gc_candidates after purging collected skb.\n\nThen, we need to set NULL to oob_skb before calling kfree_skb() because\nit calls last fput() and triggers unix_release_sock(), where we call\nduplicate kfree_skb(u-\u003eoob_skb) if not NULL.\n\nNote that the leaked socket remained being linked to a global list, so\nkmemleak also could not detect it.  We need to check /proc/net/protocol\nto notice the unfreed socket.\n\n[0]:\nWARNING: CPU: 0 PID: 2863 at net/unix/garbage.c:345 __unix_gc+0xc74/0xe80 net/unix/garbage.c:345\nModules linked in:\nCPU: 0 PID: 2863 Comm: kworker/u4:11 Not tainted 6.8.0-rc1-syzkaller-00583-g1701940b1a02 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nWorkqueue: events_unbound __unix_gc\nRIP: 0010:__unix_gc+0xc74/0xe80 net/unix/garbage.c:345\nCode: 8b 5c 24 50 e9 86 f8 ff ff e8 f8 e4 22 f8 31 d2 48 c7 c6 30 6a 69 89 4c 89 ef e8 97 ef ff ff e9 80 f9 ff ff e8 dd e4 22 f8 90 \u003c0f\u003e 0b 90 e9 7b fd ff ff 48 89 df e8 5c e7 7c f8 e9 d3 f8 ff ff e8\nRSP: 0018:ffffc9000b03fba0 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: ffffc9000b03fc10 RCX: ffffffff816c493e\nRDX: ffff88802c02d940 RSI: ffffffff896982f3 RDI: ffffc9000b03fb30\nRBP: ffffc9000b03fce0 R08: 0000000000000001 R09: fffff52001607f66\nR10: 0000000000000003 R11: 0000000000000002 R12: dffffc0000000000\nR13: ffffc9000b03fc10 R14: ffffc9000b03fc10 R15: 0000000000000001\nFS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00005559c8677a60 CR3: 000000000d57a000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n process_one_work+0x889/0x15e0 kernel/workqueue.c:2633\n process_scheduled_works kernel/workqueue.c:2706 [inline]\n worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787\n kthread+0x2c6/0x3b0 kernel/kthread.c:388\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242\n \u003c/TASK\u003e"
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        "dateUpdated": "2024-11-05T09:13:41.761Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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      "title": "af_unix: Call kfree_skb() for dead unix_(sk)-\u003eoob_skb in GC.",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26676",
    "datePublished": "2024-04-02T07:01:40.758Z",
    "dateReserved": "2024-02-19T14:20:24.151Z",
    "dateUpdated": "2024-11-05T17:59:44.664Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26676\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-02T07:15:44.170\",\"lastModified\":\"2024-11-05T18:35:06.087\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\naf_unix: Call kfree_skb() for dead unix_(sk)-\u003eoob_skb in GC.\\n\\nsyzbot reported a warning [0] in __unix_gc() with a repro, which\\ncreates a socketpair and sends one socket\u0027s fd to itself using the\\npeer.\\n\\n  socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0\\n  sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=\\\"\\\\360\\\", iov_len=1}],\\n          msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET,\\n                                      cmsg_type=SCM_RIGHTS, cmsg_data=[3]}],\\n          msg_controllen=24, msg_flags=0}, MSG_OOB|MSG_PROBE|MSG_DONTWAIT|MSG_ZEROCOPY) = 1\\n\\nThis forms a self-cyclic reference that GC should finally untangle\\nbut does not due to lack of MSG_OOB handling, resulting in memory\\nleak.\\n\\nRecently, commit 11498715f266 (\\\"af_unix: Remove io_uring code for\\nGC.\\\") removed io_uring\u0027s dead code in GC and revealed the problem.\\n\\nThe code was executed at the final stage of GC and unconditionally\\nmoved all GC candidates from gc_candidates to gc_inflight_list.\\nThat papered over the reported problem by always making the following\\nWARN_ON_ONCE(!list_empty(\u0026gc_candidates)) false.\\n\\nThe problem has been there since commit 2aab4b969002 (\\\"af_unix: fix\\nstruct pid leaks in OOB support\\\") added full scm support for MSG_OOB\\nwhile fixing another bug.\\n\\nTo fix this problem, we must call kfree_skb() for unix_sk(sk)-\u003eoob_skb\\nif the socket still exists in gc_candidates after purging collected skb.\\n\\nThen, we need to set NULL to oob_skb before calling kfree_skb() because\\nit calls last fput() and triggers unix_release_sock(), where we call\\nduplicate kfree_skb(u-\u003eoob_skb) if not NULL.\\n\\nNote that the leaked socket remained being linked to a global list, so\\nkmemleak also could not detect it.  We need to check /proc/net/protocol\\nto notice the unfreed socket.\\n\\n[0]:\\nWARNING: CPU: 0 PID: 2863 at net/unix/garbage.c:345 __unix_gc+0xc74/0xe80 net/unix/garbage.c:345\\nModules linked in:\\nCPU: 0 PID: 2863 Comm: kworker/u4:11 Not tainted 6.8.0-rc1-syzkaller-00583-g1701940b1a02 #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\\nWorkqueue: events_unbound __unix_gc\\nRIP: 0010:__unix_gc+0xc74/0xe80 net/unix/garbage.c:345\\nCode: 8b 5c 24 50 e9 86 f8 ff ff e8 f8 e4 22 f8 31 d2 48 c7 c6 30 6a 69 89 4c 89 ef e8 97 ef ff ff e9 80 f9 ff ff e8 dd e4 22 f8 90 \u003c0f\u003e 0b 90 e9 7b fd ff ff 48 89 df e8 5c e7 7c f8 e9 d3 f8 ff ff e8\\nRSP: 0018:ffffc9000b03fba0 EFLAGS: 00010293\\nRAX: 0000000000000000 RBX: ffffc9000b03fc10 RCX: ffffffff816c493e\\nRDX: ffff88802c02d940 RSI: ffffffff896982f3 RDI: ffffc9000b03fb30\\nRBP: ffffc9000b03fce0 R08: 0000000000000001 R09: fffff52001607f66\\nR10: 0000000000000003 R11: 0000000000000002 R12: dffffc0000000000\\nR13: ffffc9000b03fc10 R14: ffffc9000b03fc10 R15: 0000000000000001\\nFS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00005559c8677a60 CR3: 000000000d57a000 CR4: 00000000003506f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cTASK\u003e\\n process_one_work+0x889/0x15e0 kernel/workqueue.c:2633\\n process_scheduled_works kernel/workqueue.c:2706 [inline]\\n worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787\\n kthread+0x2c6/0x3b0 kernel/kthread.c:388\\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\\n ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242\\n \u003c/TASK\u003e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: af_unix: Llame a kfree_skb() para unix_(sk)-\u0026gt;oob_skb muerto en GC. syzbot inform\u00f3 una advertencia [0] en __unix_gc() con una reproducci\u00f3n, que crea un par de sockets y se env\u00eda el fd de un socket a s\u00ed mismo utilizando el par. socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=\\\"\\\\360\\\", iov_len=1}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[3]}], msg_controllen=24, msg_flags=0}, MSG_OOB|MSG_PROBE|MSG_DONTWAIT|MSG_ZEROCOPY) = 1 Esto forma una referencia autoc\u00edclica ese GC finalmente deber\u00eda desenredarse, pero no lo hace debido a la falta de manejo de MSG_OOB, lo que resulta en una p\u00e9rdida de memoria. Recientemente, el commit 11498715f266 (\\\"af_unix: Eliminar el c\u00f3digo io_uring para GC.\\\") elimin\u00f3 el c\u00f3digo inactivo de io_uring en GC y revel\u00f3 el problema. El c\u00f3digo se ejecut\u00f3 en la etapa final de GC y movi\u00f3 incondicionalmente todos los candidatos de GC de gc_candidates a gc_inflight_list. Eso ocult\u00f3 el problema informado haciendo siempre que lo siguiente WARN_ON_ONCE(!list_empty(\u0026amp;gc_candidates)) fuera falso. El problema ha estado ah\u00ed desde que el commit 2aab4b969002 (\\\"af_unix: corrige fugas de struct pid en soporte OOB\\\") agreg\u00f3 soporte completo de scm para MSG_OOB mientras solucionaba otro error. Para solucionar este problema, debemos llamar a kfree_skb() para unix_sk(sk)-\u0026gt;oob_skb si el socket todav\u00eda existe en gc_candidates despu\u00e9s de purgar el skb recopilado. Luego, necesitamos establecer NULL en oob_skb antes de llamar a kfree_skb() porque llama al \u00faltimo fput() y activa unix_release_sock(), donde llamamos al duplicado kfree_skb(u-\u0026gt;oob_skb) si no es NULL. Tenga en cuenta que el socket filtrado segu\u00eda vinculado a una lista global, por lo que kmemleak tampoco pudo detectarlo. Necesitamos verificar /proc/net/protocol para notar el socket no liberado. [0]: ADVERTENCIA: CPU: 0 PID: 2863 en net/unix/garbage.c:345 __unix_gc+0xc74/0xe80 net/unix/garbage.c:345 M\u00f3dulos vinculados en: CPU: 0 PID: 2863 Comm: kworker/ u4:11 No contaminado 6.8.0-rc1-syzkaller-00583-g1701940b1a02 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 25/01/2024 Cola de trabajo: events_unbound __unix_gc RIP: 0010:__unix_gc+0xc74/0xe80 net/unix/garbage.c:345 C\u00f3digo: 8b 5c 24 50 e9 86 f8 ff ff e8 f8 e4 22 f8 31 d2 48 c7 c6 30 6a 69 89 4c 89 ef e8 97 ef ff ff e9 80 f9 ff ff e8 dd e4 22 f8 90 \u0026lt;0f\u0026gt; 0b 90 e9 7b fd ff ff 48 89 df e8 5c e7 7c f8 e9 d3 f8 ff ff e8 RSP: 0018:ffffc9000b03fba0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff c9000b03fc10 RCX: ffffffff816c493e RDX: ffff88802c02d940 RSI: ffffffff896982f3 RDI: ffffc9000b03fb30 RBP: ffffc9000b03fce0 R08: 0000000000000001 R09: fffff52001607f66 R10: 00000000000000003 R11: 00000000000000002 R12: dffffc 0000000000 R13: ffffc9000b03fc10 R14: ffffc9000b03fc10 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:000 0000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005559c8677a60 CR3: 000000000d57a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 00000000 00000000 DR2: 0000000000000000 DR3: 00000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas:  Process_one_work+0x889/0x15e0 kernel/workqueue.c :2633 Process_scheduled_works kernel/workqueue.c:2706 [en l\u00ednea] work_thread+0x8b9/0x12a0 kernel/workqueue.c:2787 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process. c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 \"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1279f9d9dec2d7462823a18c29ad61359e0a007d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4fe505c63aa3273135a57597fda761e9aecc7668\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82ae47c5c3a6b27fdc0f9e83c1499cb439c56140\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b74aa9ce13d02b7fd37c5325b99854f91b9b4276\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e0e09186d8821ad59806115d347ea32efa43ca4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.