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CVE-2024-56642

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

tipc: Fix use-after-free of kernel socket in cleanup_bearer().

syzkaller reported a use-after-free of UDP kernel socket in cleanup_bearer() without repro. [0][1]

When bearer_disable() calls tipc_udp_disable(), cleanup of the UDP kernel socket is deferred by work calling cleanup_bearer().

tipc_exit_net() waits for such works to finish by checking tipc_net(net)->wq_count. However, the work decrements the count too early before releasing the kernel socket, unblocking cleanup_net() and resulting in use-after-free.

Let's move the decrement after releasing the socket in cleanup_bearer().

Detalles técnicos trazas, registros y código del informe original
[0]:
ref_tracker: net notrefcnt@000000009b3d1faf has 1/1 users at
     sk_alloc+0x438/0x608
     inet_create+0x4c8/0xcb0
     __sock_create+0x350/0x6b8
     sock_create_kern+0x58/0x78
     udp_sock_create4+0x68/0x398
     udp_sock_create+0x88/0xc8
     tipc_udp_enable+0x5e8/0x848
     __tipc_nl_bearer_enable+0x84c/0xed8
     tipc_nl_bearer_enable+0x38/0x60
     genl_family_rcv_msg_doit+0x170/0x248
     genl_rcv_msg+0x400/0x5b0
     netlink_rcv_skb+0x1dc/0x398
     genl_rcv+0x44/0x68
     netlink_unicast+0x678/0x8b0
     netlink_sendmsg+0x5e4/0x898
     ____sys_sendmsg+0x500/0x830

[1]:
BUG: KMSAN: use-after-free in udp_hashslot include/net/udp.h:85 [inline]
BUG: KMSAN: use-after-free in udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979
 udp_hashslot include/net/udp.h:85 [inline]
 udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979
 sk_common_release+0xaf/0x3f0 net/core/sock.c:3820
 inet_release+0x1e0/0x260 net/ipv4/af_inet.c:437
 inet6_release+0x6f/0xd0 net/ipv6/af_inet6.c:489
 __sock_release net/socket.c:658 [inline]
 sock_release+0xa0/0x210 net/socket.c:686
 cleanup_bearer+0x42d/0x4c0 net/tipc/udp_media.c:819
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310
 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391
 kthread+0x531/0x6b0 kernel/kthread.c:389
 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244

Uninit was created at:
 slab_free_hook mm/slub.c:2269 [inline]
 slab_free mm/slub.c:4580 [inline]
 kmem_cache_free+0x207/0xc40 mm/slub.c:4682
 net_free net/core/net_namespace.c:454 [inline]
 cleanup_net+0x16f2/0x19d0 net/core/net_namespace.c:647
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310
 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391
 kthread+0x531/0x6b0 kernel/kthread.c:389
 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244

CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.12.0-rc1-00131-gf66ebf37d69c #7 91723d6f74857f70725e1583cba3cf4adc716cfa
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
Workqueue: events cleanup_bearer

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L, PR:L) de use-after-free (CWE-416) en kernel Linux que permite DoS o corrupción de memoria; requiere privilegios locales para trigger.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Tecnologías afectadas (1)

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2024-56642",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "automatable": "no"
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            {
              "technicalImpact": "total"
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          "version": "2.0.3",
          "timestamp": "2025-02-11T15:41:46.826025Z"
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
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      {
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        "cvssData": {
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              "versionType": "git"
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            {
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              "versionType": "git"
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            {
              "status": "affected",
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.4.124",
              "lessThan": "5.4.287",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.10.42",
              "lessThan": "5.10.231",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.12.9",
              "lessThan": "5.13",
              "versionType": "semver"
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          ],
          "programFiles": [
            "net/tipc/udp_media.c"
          ],
          "defaultStatus": "unaffected"
        },
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              "versionType": "semver"
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              "version": "5.4.287",
              "versionType": "semver",
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            },
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              "version": "5.10.231",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.174",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.66",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.5",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/tipc/udp_media.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2024-12-27T15:15:23.930",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4e69457f9dfae67435f3ccf29008768eae860415",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6a2fa13312e51a621f652d522d7e2df7066330b6",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d00d4470bf8c4282617a3a10e76b20a9c7e4cffa",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      ],
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      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: Fix use-after-free of kernel socket in cleanup_bearer().\n\nsyzkaller reported a use-after-free of UDP kernel socket\nin cleanup_bearer() without repro. [0][1]\n\nWhen bearer_disable() calls tipc_udp_disable(), cleanup\nof the UDP kernel socket is deferred by work calling\ncleanup_bearer().\n\ntipc_exit_net() waits for such works to finish by checking\ntipc_net(net)->wq_count.  However, the work decrements the\ncount too early before releasing the kernel socket,\nunblocking cleanup_net() and resulting in use-after-free.\n\nLet's move the decrement after releasing the socket in\ncleanup_bearer().\n\n[0]:\nref_tracker: net notrefcnt@000000009b3d1faf has 1/1 users at\n     sk_alloc+0x438/0x608\n     inet_create+0x4c8/0xcb0\n     __sock_create+0x350/0x6b8\n     sock_create_kern+0x58/0x78\n     udp_sock_create4+0x68/0x398\n     udp_sock_create+0x88/0xc8\n     tipc_udp_enable+0x5e8/0x848\n     __tipc_nl_bearer_enable+0x84c/0xed8\n     tipc_nl_bearer_enable+0x38/0x60\n     genl_family_rcv_msg_doit+0x170/0x248\n     genl_rcv_msg+0x400/0x5b0\n     netlink_rcv_skb+0x1dc/0x398\n     genl_rcv+0x44/0x68\n     netlink_unicast+0x678/0x8b0\n     netlink_sendmsg+0x5e4/0x898\n     ____sys_sendmsg+0x500/0x830\n\n[1]:\nBUG: KMSAN: use-after-free in udp_hashslot include/net/udp.h:85 [inline]\nBUG: KMSAN: use-after-free in udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979\n udp_hashslot include/net/udp.h:85 [inline]\n udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979\n sk_common_release+0xaf/0x3f0 net/core/sock.c:3820\n inet_release+0x1e0/0x260 net/ipv4/af_inet.c:437\n inet6_release+0x6f/0xd0 net/ipv6/af_inet6.c:489\n __sock_release net/socket.c:658 [inline]\n sock_release+0xa0/0x210 net/socket.c:686\n cleanup_bearer+0x42d/0x4c0 net/tipc/udp_media.c:819\n process_one_work kernel/workqueue.c:3229 [inline]\n process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310\n worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391\n kthread+0x531/0x6b0 kernel/kthread.c:389\n ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244\n\nUninit was created at:\n slab_free_hook mm/slub.c:2269 [inline]\n slab_free mm/slub.c:4580 [inline]\n kmem_cache_free+0x207/0xc40 mm/slub.c:4682\n net_free net/core/net_namespace.c:454 [inline]\n cleanup_net+0x16f2/0x19d0 net/core/net_namespace.c:647\n process_one_work kernel/workqueue.c:3229 [inline]\n process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310\n worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391\n kthread+0x531/0x6b0 kernel/kthread.c:389\n ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244\n\nCPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted 6.12.0-rc1-00131-gf66ebf37d69c #7 91723d6f74857f70725e1583cba3cf4adc716cfa\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\nWorkqueue: events cleanup_bearer"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tipc: Se corrige el use-after-free del socket del kernel en cleanup_bearer(). syzkaller informó un use-after-free del socket del kernel UDP en cleanup_bearer() sin reproducción. [0][1] Cuando bearer_disable() llama a tipc_udp_disable(), la desinfección del socket del kernel UDP se pospone mediante el trabajo que llama a cleanup_bearer(). tipc_net_stop() espera a que finalicen dichos trabajos comprobando tipc_net(net)->wq_count. Sin embargo, el trabajo disminuye el recuento demasiado pronto antes de liberar el socket del kernel, desbloqueando cleanup_net() y dando como resultado un use-after-free. Muevamos la disminución después de liberar el socket en cleanup_bearer(). [0]: ref_tracker: net notrefcnt@000000009b3d1faf tiene 1/1 usuarios en sk_alloc+0x438/0x608 inet_create+0x4c8/0xcb0 __sock_create+0x350/0x6b8 sock_create_kern+0x58/0x78 udp_sock_create4+0x68/0x398 udp_sock_create+0x88/0xc8 tipc_udp_enable+0x5e8/0x848 __tipc_nl_bearer_enable+0x84c/0xed8 tipc_nl_bearer_enable+0x38/0x60 genl_family_rcv_msg_doit+0x170/0x248 genl_rcv_msg+0x400/0x5b0 netlink_rcv_skb+0x1dc/0x398 genl_rcv+0x44/0x68 netlink_unicast+0x678/0x8b0 netlink_sendmsg+0x5e4/0x898 ____sys_sendmsg+0x500/0x830 [1]: ERROR: KMSAN: use-after-free en udp_hashslot include/net/udp.h:85 [en línea] ERROR: KMSAN: use-after-free en udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979 udp_hashslot include/net/udp.h:85 [en línea] udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979 sk_common_release+0xaf/0x3f0 net/core/sock.c:3820 inet_release+0x1e0/0x260 net/ipv4/af_inet.c:437 inet6_release+0x6f/0xd0 net/ipv6/af_inet6.c:489 __sock_release net/socket.c:658 [en línea] sock_release+0xa0/0x210 net/socket.c:686 cleanup_bearer+0x42d/0x4c0 net/tipc/udp_media.c:819 proceso_one_work kernel/workqueue.c:3229 [en línea] proceso_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391 kthread+0x531/0x6b0 kernel/kthread.c:389 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244 Uninit se creó en: slab_free_hook mm/slub.c:2269 [en línea] slab_free mm/slub.c:4580 [en línea] kmem_cache_free+0x207/0xc40 mm/slub.c:4682 net_free net/core/net_namespace.c:454 [en línea] cleanup_net+0x16f2/0x19d0 net/core/net_namespace.c:647 process_one_work kernel/workqueue.c:3229 [en línea] process_scheduled_works+0xcaf/0x1c90 kernel/workqueue.c:3310 worker_thread+0xf6c/0x1510 kernel/workqueue.c:3391 kthread+0x531/0x6b0 kernel/kthread.c:389 ret_from_fork+0x60/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244 CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 No contaminado 6.12.0-rc1-00131-gf66ebf37d69c #7 91723d6f74857f70725e1583cba3cf4adc716cfa Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 01/04/2014 Cola de trabajo: eventos cleanup_bearer"
    }
  ],
  "lastModified": "2026-06-17T08:12:37.420",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7446589C-7AB5-4517-9C06-B453135BFA99",
              "versionEndExcluding": "5.4.287",
              "versionStartIncluding": "4.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B5C644CC-2BD7-4E32-BC54-8DCC7ABE9935",
              "versionEndExcluding": "5.10.231",
              "versionStartIncluding": "5.5"
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