Vulnerability-Lookup

FKIE_CVE-2024-36972

Vulnerability from fkie_nvd - Published: 2024-06-10 15:15 - Updated: 2026-08-04 11:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: af_unix: Update unix_sk(sk)->oob_skb under sk_receive_queue lock. Billy Jheng Bing-Jhong reported a race between __unix_gc() and queue_oob(). __unix_gc() tries to garbage-collect close()d inflight sockets, and then if the socket has MSG_OOB in unix_sk(sk)->oob_skb, GC will drop the reference and set NULL to it locklessly. However, the peer socket still can send MSG_OOB message and queue_oob() can update unix_sk(sk)->oob_skb concurrently, leading NULL pointer dereference. [0] To fix the issue, let's update unix_sk(sk)->oob_skb under the sk_receive_queue's lock and take it everywhere we touch oob_skb. Note that we defer kfree_skb() in manage_oob() to silence lockdep false-positive (See [1]). [0]: BUG: kernel NULL pointer dereference, address: 0000000000000008 PF: supervisor write access in kernel mode PF: error_code(0x0002) - not-present page PGD 8000000009f5e067 P4D 8000000009f5e067 PUD 9f5d067 PMD 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 3 PID: 50 Comm: kworker/3:1 Not tainted 6.9.0-rc5-00191-gd091e579b864 #110 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 Workqueue: events delayed_fput RIP: 0010:skb_dequeue (./include/linux/skbuff.h:2386 ./include/linux/skbuff.h:2402 net/core/skbuff.c:3847) Code: 39 e3 74 3e 8b 43 10 48 89 ef 83 e8 01 89 43 10 49 8b 44 24 08 49 c7 44 24 08 00 00 00 00 49 8b 14 24 49 c7 04 24 00 00 00 00 <48> 89 42 08 48 89 10 e8 e7 c5 42 00 4c 89 e0 5b 5d 41 5c c3 cc cc RSP: 0018:ffffc900001bfd48 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff8880088f5ae8 RCX: 00000000361289f9 RDX: 0000000000000000 RSI: 0000000000000206 RDI: ffff8880088f5b00 RBP: ffff8880088f5b00 R08: 0000000000080000 R09: 0000000000000001 R10: 0000000000000003 R11: 0000000000000001 R12: ffff8880056b6a00 R13: ffff8880088f5280 R14: 0000000000000001 R15: ffff8880088f5a80 FS: 0000000000000000(0000) GS:ffff88807dd80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000006314000 CR4: 00000000007506f0 PKRU: 55555554 Call Trace: <TASK> unix_release_sock (net/unix/af_unix.c:654) unix_release (net/unix/af_unix.c:1050) __sock_release (net/socket.c:660) sock_close (net/socket.c:1423) __fput (fs/file_table.c:423) delayed_fput (fs/file_table.c:444 (discriminator 3)) process_one_work (kernel/workqueue.c:3259) worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) kthread (kernel/kthread.c:388) ret_from_fork (arch/x86/kernel/process.c:153) ret_from_fork_asm (arch/x86/entry/entry_64.S:257) </TASK> Modules linked in: CR2: 0000000000000008

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4708f49add84a57ce0ccc7bf9a6269845c631cc3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4bf6964451c3cb411fbaa1ae8b214b3d97a59bf1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/518a994aa0b87d96f1bc6678a7035df5d1fcd7a1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9841991a446c87f90f66f4b9fee6fe934c1336a2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d59ae9314b97e01c76a4171472441e55721ba636	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/4708f49add84a57ce0ccc7bf9a6269845c631cc3	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/4bf6964451c3cb411fbaa1ae8b214b3d97a59bf1	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/518a994aa0b87d96f1bc6678a7035df5d1fcd7a1	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/9841991a446c87f90f66f4b9fee6fe934c1336a2	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/d59ae9314b97e01c76a4171472441e55721ba636	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
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          "product": "Linux",
          "programFiles": [
            "net/unix/af_unix.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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            {
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              "versionType": "git"
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            {
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
            {
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              "version": "82ae47c5c3a6b27fdc0f9e83c1499cb439c56140",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.161",
              "status": "affected",
              "version": "5.15.149",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.93",
              "status": "affected",
              "version": "6.1.78",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.33",
              "status": "affected",
              "version": "6.6.17",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "6.7.5",
              "versionType": "semver"
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.161",
              "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": "6.9.*",
              "status": "unaffected",
              "version": "6.9.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
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              "lessThan": "518a994aa0b8",
              "status": "affected",
              "version": "4fe505c63aa3",
              "versionType": "git"
            },
            {
              "lessThan": "4bf6964451c3",
              "status": "affected",
              "version": "e0e09186d882",
              "versionType": "git"
            },
            {
              "lessThan": "d59ae9314b97",
              "status": "affected",
              "version": "b74aa9ce13d0",
              "versionType": "custom"
            },
            {
              "lessThan": "4708f49add84",
              "status": "affected",
              "version": "1279f9d9dec2",
              "versionType": "custom"
            },
            {
              "lessThan": "9841991a446c",
              "status": "affected",
              "version": "1279f9d9dec2",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:*"
          ],
          "defaultStatus": "affected",
          "product": "linux_kernel",
          "vendor": "linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B352E704-FEF8-4BA0-9064-0310CA037F76",
              "versionEndExcluding": "5.15.161",
              "versionStartIncluding": "5.15.149",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1CB8B30F-8348-4301-9CC0-BAC96389E8FF",
              "versionEndExcluding": "6.1.93",
              "versionStartIncluding": "6.1.78",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AD0395CE-7CC6-456D-8D56-AD099301D02C",
              "versionEndExcluding": "6.6.33",
              "versionStartIncluding": "6.6.17",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9DDC3C50-22E5-4037-AF83-67F18752FCA2",
              "versionEndExcluding": "6.9.4",
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Update unix_sk(sk)-\u003eoob_skb under sk_receive_queue lock.\n\nBilly Jheng Bing-Jhong reported a race between __unix_gc() and\nqueue_oob().\n\n__unix_gc() tries to garbage-collect close()d inflight sockets,\nand then if the socket has MSG_OOB in unix_sk(sk)-\u003eoob_skb, GC\nwill drop the reference and set NULL to it locklessly.\n\nHowever, the peer socket still can send MSG_OOB message and\nqueue_oob() can update unix_sk(sk)-\u003eoob_skb concurrently, leading\nNULL pointer dereference. [0]\n\nTo fix the issue, let\u0027s update unix_sk(sk)-\u003eoob_skb under the\nsk_receive_queue\u0027s lock and take it everywhere we touch oob_skb.\n\nNote that we defer kfree_skb() in manage_oob() to silence lockdep\nfalse-positive (See [1]).\n\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000008\n PF: supervisor write access in kernel mode\n PF: error_code(0x0002) - not-present page\nPGD 8000000009f5e067 P4D 8000000009f5e067 PUD 9f5d067 PMD 0\nOops: 0002 [#1] PREEMPT SMP PTI\nCPU: 3 PID: 50 Comm: kworker/3:1 Not tainted 6.9.0-rc5-00191-gd091e579b864 #110\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\nWorkqueue: events delayed_fput\nRIP: 0010:skb_dequeue (./include/linux/skbuff.h:2386 ./include/linux/skbuff.h:2402 net/core/skbuff.c:3847)\nCode: 39 e3 74 3e 8b 43 10 48 89 ef 83 e8 01 89 43 10 49 8b 44 24 08 49 c7 44 24 08 00 00 00 00 49 8b 14 24 49 c7 04 24 00 00 00 00 \u003c48\u003e 89 42 08 48 89 10 e8 e7 c5 42 00 4c 89 e0 5b 5d 41 5c c3 cc cc\nRSP: 0018:ffffc900001bfd48 EFLAGS: 00000002\nRAX: 0000000000000000 RBX: ffff8880088f5ae8 RCX: 00000000361289f9\nRDX: 0000000000000000 RSI: 0000000000000206 RDI: ffff8880088f5b00\nRBP: ffff8880088f5b00 R08: 0000000000080000 R09: 0000000000000001\nR10: 0000000000000003 R11: 0000000000000001 R12: ffff8880056b6a00\nR13: ffff8880088f5280 R14: 0000000000000001 R15: ffff8880088f5a80\nFS:  0000000000000000(0000) GS:ffff88807dd80000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000008 CR3: 0000000006314000 CR4: 00000000007506f0\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n unix_release_sock (net/unix/af_unix.c:654)\n unix_release (net/unix/af_unix.c:1050)\n __sock_release (net/socket.c:660)\n sock_close (net/socket.c:1423)\n __fput (fs/file_table.c:423)\n delayed_fput (fs/file_table.c:444 (discriminator 3))\n process_one_work (kernel/workqueue.c:3259)\n worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416)\n kthread (kernel/kthread.c:388)\n ret_from_fork (arch/x86/kernel/process.c:153)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:257)\n \u003c/TASK\u003e\nModules linked in:\nCR2: 0000000000000008"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: af_unix: actualice unix_sk(sk)-\u0026gt;oob_skb bajo el bloqueo sk_receive_queue. Billy Jheng Bing-Jhong inform\u00f3 de una ejecuci\u00f3n entre __unix_gc() y queue_oob(). __unix_gc() intenta recolectar basura de sockets en vuelo close()d, y luego, si el socket tiene MSG_OOB en unix_sk(sk)-\u0026gt;oob_skb, GC eliminar\u00e1 la referencia y establecer\u00e1 NULL sin bloqueo. Sin embargo, el socket del par a\u00fan puede enviar el mensaje MSG_OOB y queue_oob() puede actualizar unix_sk(sk)-\u0026gt;oob_skb simult\u00e1neamente, lo que lleva a la desreferencia del puntero NULL. [0] Para solucionar el problema, actualicemos unix_sk(sk)-\u0026gt;oob_skb bajo el bloqueo de sk_receive_queue y lo llevemos a todos los lugares donde toquemos oob_skb. Tenga en cuenta que posponemos kfree_skb() en Manage_oob() para silenciar el falso positivo de Lockdep (consulte [1]). [0]: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000008 PF: acceso de escritura del supervisor en modo kernel PF: error_code(0x0002) - p\u00e1gina no presente PGD 8000000009f5e067 P4D 8000000009f5e067 PUD 9f5d067 PMD 0 Ups: 02 [#1] SMP ADELANTADO PTI CPU: 3 PID: 50 Comm: kworker/3:1 No contaminado 6.9.0-rc5-00191-gd091e579b864 #110 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0- gd239552ce722-prebuilt.qemu.org 01/04/2014 Cola de trabajo: eventos retrasados_fput RIP: 0010:skb_dequeue (./include/linux/skbuff.h:2386 ./include/linux/skbuff.h:2402 net/core/skbuff. c:3847) C\u00f3digo: 39 e3 74 3e 8b 43 10 48 89 ef 83 e8 01 89 43 10 49 8b 44 24 08 49 c7 44 24 08 00 00 00 00 49 8b 14 24 49 c7 04 24 00 0 00 00 \u0026lt;48 \u0026gt; 89 42 08 48 89 10 e8 e7 c5 42 00 4c 89 e0 5b 5d 41 5c c3 cc cc RSP: 0018:ffffc900001bfd48 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 80088f5ae8 RCX: 00000000361289f9 RDX: 0000000000000000 RSI: 0000000000000206 RDI: ffff8880088f5b00 RBP: ffff8880088f5b00 R08: 0000000000080000 R09: 0000000000000001 R10: 0000000000000003 R11: 00000000000000001 R12: ffff8880056b6a00 R13: ffff8880088f5280 R14: 0000000000000001 R15: ffff8880088f5a80 FS: 0000000000000000(0000) GS:ffff88807dd80000(0000) knlGS:00000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0 : 0000000080050033 CR2: 0000000000000008 CR3: 0000000006314000 CR4: 00000000007506f0 PKRU: 55555554 Seguimiento de llamadas:  unix_release_sock (net/unix/af_unix.c:654) ix_release (net/unix/af_unix.c:1050) __sock_release (net/socket. c:660) sock_close (net/socket.c:1423) __fput (fs/file_table.c:423) retrasado_fput (fs/file_table.c:444 (discriminador 3)) Process_one_work (kernel/workqueue.c:3259) trabajador_thread ( kernel/workqueue.c:3329 kernel/workqueue.c:3416) kthread (kernel/kthread.c:388) ret_from_fork (arch/x86/kernel/process.c:153) ret_from_fork_asm (arch/x86/entry/entry_64.S :257)  M\u00f3dulos vinculados en: CR2: 0000000000000008"
    }
  ],
  "id": "CVE-2024-36972",
  "lastModified": "2026-08-04T11:18:36.757",
  "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": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-36972",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-05T03:56:02.065864Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-06-10T15:15:52.617",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/4708f49add84a57ce0ccc7bf9a6269845c631cc3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "url": "https://git.kernel.org/stable/c/4bf6964451c3cb411fbaa1ae8b214b3d97a59bf1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "url": "https://git.kernel.org/stable/c/518a994aa0b87d96f1bc6678a7035df5d1fcd7a1"
    },
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      "url": "https://git.kernel.org/stable/c/d59ae9314b97e01c76a4171472441e55721ba636"
    },
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      "url": "https://git.kernel.org/stable/c/4708f49add84a57ce0ccc7bf9a6269845c631cc3"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/4bf6964451c3cb411fbaa1ae8b214b3d97a59bf1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary"
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  ]
}

CVE-2024-36972 (GCVE-0-2024-36972)

Vulnerability from cvelistv5 – Published: 2024-06-10 14:57 – Updated: 2026-08-05 11:32

Title

af_unix: Update unix_sk(sk)->oob_skb under sk_receive_queue lock.

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-05 03:56 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/518a994aa0b87d96f…
https://git.kernel.org/stable/c/4bf6964451c3cb411…
https://git.kernel.org/stable/c/d59ae9314b97e01c7…
https://git.kernel.org/stable/c/4708f49add84a57ce…
https://git.kernel.org/stable/c/9841991a446c87f90…

Impacted products

4 products

Vendor	Product	Version
Linux	Linux	Affected: 4fe505c63aa3273135a57597fda761e9aecc7668 , < 518a994aa0b87d96f1bc6678a7035df5d1fcd7a1 (git) Affected: e0e09186d8821ad59806115d347ea32efa43ca4b , < 4bf6964451c3cb411fbaa1ae8b214b3d97a59bf1 (git) Affected: b74aa9ce13d02b7fd37c5325b99854f91b9b4276 , < d59ae9314b97e01c76a4171472441e55721ba636 (git) Affected: 1279f9d9dec2d7462823a18c29ad61359e0a007d , < 4708f49add84a57ce0ccc7bf9a6269845c631cc3 (git) Affected: 1279f9d9dec2d7462823a18c29ad61359e0a007d , < 9841991a446c87f90f66f4b9fee6fe934c1336a2 (git) Affected: 82ae47c5c3a6b27fdc0f9e83c1499cb439c56140 (git) Affected: 5.15.149 , < 5.15.161 (semver) Affected: 6.1.78 , < 6.1.93 (semver) Affected: 6.6.17 , < 6.6.33 (semver) Affected: 6.7.5 , < 6.8 (semver)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 5.15.161 , ≤ 5.15.* (semver) Unaffected: 6.1.93 , ≤ 6.1.* (semver) Unaffected: 6.6.33 , ≤ 6.6.* (semver) Unaffected: 6.9.4 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix)
linux	linux_kernel	Affected: 4fe505c63aa3 , < 518a994aa0b8 (git) Affected: e0e09186d882 , < 4bf6964451c3 (git) Affected: b74aa9ce13d0 , < d59ae9314b97 (custom) Affected: 1279f9d9dec2 , < 4708f49add84 (custom) Affected: 1279f9d9dec2 , < 9841991a446c (custom) cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	Affected: 6.8 cpe:2.3:o:linux:linux_kernel:6.8:-::::::

Show details on NVD website

JSON

To clipboard

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Update unix_sk(sk)-\u003eoob_skb under sk_receive_queue lock.\n\nBilly Jheng Bing-Jhong reported a race between __unix_gc() and\nqueue_oob().\n\n__unix_gc() tries to garbage-collect close()d inflight sockets,\nand then if the socket has MSG_OOB in unix_sk(sk)-\u003eoob_skb, GC\nwill drop the reference and set NULL to it locklessly.\n\nHowever, the peer socket still can send MSG_OOB message and\nqueue_oob() can update unix_sk(sk)-\u003eoob_skb concurrently, leading\nNULL pointer dereference. [0]\n\nTo fix the issue, let\u0027s update unix_sk(sk)-\u003eoob_skb under the\nsk_receive_queue\u0027s lock and take it everywhere we touch oob_skb.\n\nNote that we defer kfree_skb() in manage_oob() to silence lockdep\nfalse-positive (See [1]).\n\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000008\n PF: supervisor write access in kernel mode\n PF: error_code(0x0002) - not-present page\nPGD 8000000009f5e067 P4D 8000000009f5e067 PUD 9f5d067 PMD 0\nOops: 0002 [#1] PREEMPT SMP PTI\nCPU: 3 PID: 50 Comm: kworker/3:1 Not tainted 6.9.0-rc5-00191-gd091e579b864 #110\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\nWorkqueue: events delayed_fput\nRIP: 0010:skb_dequeue (./include/linux/skbuff.h:2386 ./include/linux/skbuff.h:2402 net/core/skbuff.c:3847)\nCode: 39 e3 74 3e 8b 43 10 48 89 ef 83 e8 01 89 43 10 49 8b 44 24 08 49 c7 44 24 08 00 00 00 00 49 8b 14 24 49 c7 04 24 00 00 00 00 \u003c48\u003e 89 42 08 48 89 10 e8 e7 c5 42 00 4c 89 e0 5b 5d 41 5c c3 cc cc\nRSP: 0018:ffffc900001bfd48 EFLAGS: 00000002\nRAX: 0000000000000000 RBX: ffff8880088f5ae8 RCX: 00000000361289f9\nRDX: 0000000000000000 RSI: 0000000000000206 RDI: ffff8880088f5b00\nRBP: ffff8880088f5b00 R08: 0000000000080000 R09: 0000000000000001\nR10: 0000000000000003 R11: 0000000000000001 R12: ffff8880056b6a00\nR13: ffff8880088f5280 R14: 0000000000000001 R15: ffff8880088f5a80\nFS:  0000000000000000(0000) GS:ffff88807dd80000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000008 CR3: 0000000006314000 CR4: 00000000007506f0\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n unix_release_sock (net/unix/af_unix.c:654)\n unix_release (net/unix/af_unix.c:1050)\n __sock_release (net/socket.c:660)\n sock_close (net/socket.c:1423)\n __fput (fs/file_table.c:423)\n delayed_fput (fs/file_table.c:444 (discriminator 3))\n process_one_work (kernel/workqueue.c:3259)\n worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416)\n kthread (kernel/kthread.c:388)\n ret_from_fork (arch/x86/kernel/process.c:153)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:257)\n \u003c/TASK\u003e\nModules linked in:\nCR2: 0000000000000008"
        }
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              "value": "AV:L - AF_UNIX is local-only IPC; the race is driven from `sendmsg(MSG_OOB)` and `close()` syscalls on socketpairs, with no network-facing entry point.\nAC:L - The attacker controls both sides of the race \u2014 it queues MSG_OOB in a loop on one CPU while forcing `unix_gc()` on another by closing sockets with inflight SCM_RIGHTS cycles, and can retry indefinitely until the window is hit.\nPR:L - Any unprivileged local user can create AF_UNIX socketpairs, send MSG_OOB and SCM_RIGHTS, and close descriptors; no capabilities, namespaces, or non-default configuration are required (CONFIG_AF_UNIX_OOB is default y).\nUI:N - The attacker performs every step itself from its own processes/threads; no victim action or cooperating peer is needed since a socketpair is self-owned.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The double-free leaves a freed sk_buff linked in `sk_receive_queue`; reclaiming it with sprayed data lets the attacker control `skb-\u003edata`/`skb-\u003elen` and read arbitrary kernel memory via subsequent recvmsg.\nI:H - A use-after-free/double-free of an sk_buff yields write primitives (list unlink writes and attacker-controlled skb fields on reclaimed slab objects), which is exploitable for privilege escalation.\nA:H - The reported symptom is a kernel oops (supervisor write fault in `skb_dequeue` from `unix_release_sock`), and freed-object list corruption reliably panics the machine."
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.