CVE-2024-56642 (GCVE-0-2024-56642)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:02 – Updated: 2026-08-05 11:45
VLAI
Title
tipc: Fix use-after-free of kernel socket in cleanup_bearer().
Summary
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(). [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
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/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 2025-02-11 15:41 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa , < 4e69457f9dfae67435f3ccf29008768eae860415 (git)
Affected: 5195ec5e365a2a9331bfeb585b613a6e94f98dba , < 650ee9a22d7a2de8999fac2d45983597a0c22359 (git)
Affected: 04c26faa51d1e2fe71cf13c45791f5174c37f986 , < d2a4894f238551eae178904e7f45af87577074fd (git)
Affected: 04c26faa51d1e2fe71cf13c45791f5174c37f986 , < d62d5180c036eeac09f80660edc7a602b369125f (git)
Affected: 04c26faa51d1e2fe71cf13c45791f5174c37f986 , < d00d4470bf8c4282617a3a10e76b20a9c7e4cffa (git)
Affected: 04c26faa51d1e2fe71cf13c45791f5174c37f986 , < e48b211c4c59062cb6dd6c2c37c51a7cc235a464 (git)
Affected: 04c26faa51d1e2fe71cf13c45791f5174c37f986 , < 6a2fa13312e51a621f652d522d7e2df7066330b6 (git)
Affected: b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d (git)
Affected: 5.4.124 , < 5.4.287 (semver)
Affected: 5.10.42 , < 5.10.231 (semver)
Affected: 5.12.9 , < 5.13 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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)-\u003ewq_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\u0027s 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"
        }
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        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached through generic netlink (TIPC_NL_BEARER_ENABLE/DISABLE) plus network-namespace teardown, both of which require local access to the machine. A remote TIPC/UDP peer cannot cause bearer teardown or netns destruction, so this is not remotely triggerable.\nAC:L - The attacker controls both sides of the race \u2014 creating/destroying the netns and enabling/disabling up to three UDP bearers, repeatedly and in parallel \u2014 and the post-decrement window contains a sleepable free_percpu() in dst_cache_destroy() that can be stalled with attacker-generated load, so the race can be won reliably by looping.\nPR:L - At the time of this bug the TIPCv2 netlink mutators carried no GENL_ADMIN_PERM flag, so a fully unprivileged local user could enable/disable a UDP bearer (later confirmed and fixed by commit 86b0c540e2ea), and the netns teardown that arms the race is available to any user via unshare -Urn; even with the later gate, CAP_NET_ADMIN is obtainable in a user namespace.\nUI:N - The attacker performs every step itself \u2014 load the module, enable the bearer, tear down the namespace \u2014 with no action required from any other user.\nS:U - The use-after-free corrupts kernel memory and is exploited within the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The freed struct net is read after free in udp_lib_unhash() (udp table pointer, net_hash_mix), and reallocation of the net_cachep object gives the attacker control over the dereferenced contents, enabling kernel memory disclosure.\nI:H - After the struct net is freed, sock_prot_inuse_add() performs this_cpu_add() through a percpu pointer read from freed memory and udp_lib_unhash() takes a spinlock and does list removal through an attacker-influenceable table pointer, yielding a controlled write primitive suitable for privilege escalation.\nA:H - The use-after-free reliably corrupts the UDP hash slots and dereferences freed netns memory, producing kernel oops/panic (as captured by the KMSAN report), and can be triggered repeatedly by an unprivileged user."
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      "cve": "CVE-2024-56642",
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      "initial_release_date": "2024-12-02T00:00:00.000Z",
      "product_status:fixed": "4",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tipc: Fix use-after-free of kernel socket in cleanup_bearer().",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-56642.json",
      "version": "3"
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        "cveTags": [],
        "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)-\u003ewq_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\u0027s 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 inform\u00f3 un use-after-free del socket del kernel UDP en cleanup_bearer() sin reproducci\u00f3n. [0][1] Cuando bearer_disable() llama a tipc_udp_disable(), la desinfecci\u00f3n 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)-\u0026gt;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 disminuci\u00f3n despu\u00e9s 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 l\u00ednea] ERROR: KMSAN: use-after-free en udp_lib_unhash+0x3b8/0x930 net/ipv4/udp.c:1979 udp_hashslot include/net/udp.h:85 [en l\u00ednea] 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 l\u00ednea] 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 l\u00ednea] 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 cre\u00f3 en: slab_free_hook mm/slub.c:2269 [en l\u00ednea] slab_free mm/slub.c:4580 [en l\u00ednea] kmem_cache_free+0x207/0xc40 mm/slub.c:4682 net_free net/core/net_namespace.c:454 [en l\u00ednea] cleanup_net+0x16f2/0x19d0 net/core/net_namespace.c:647 process_one_work kernel/workqueue.c:3229 [en l\u00ednea] 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"
          }
        ],
        "id": "CVE-2024-56642",
        "lastModified": "2026-06-17T08:12:37.420",
        "metrics": {
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      "source": "Red Hat CSAF VEX",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56642.json",
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                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-02-11T15:41:46.826025Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-416",
                    "description": "CWE-416 Use After Free",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-02-11T15:41:48.309Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/tipc/udp_media.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "4e69457f9dfae67435f3ccf29008768eae860415",
                  "status": "affected",
                  "version": "d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa",
                  "versionType": "git"
                },
                {
                  "lessThan": "650ee9a22d7a2de8999fac2d45983597a0c22359",
                  "status": "affected",
                  "version": "5195ec5e365a2a9331bfeb585b613a6e94f98dba",
                  "versionType": "git"
                },
                {
                  "lessThan": "d2a4894f238551eae178904e7f45af87577074fd",
                  "status": "affected",
                  "version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
                  "versionType": "git"
                },
                {
                  "lessThan": "d62d5180c036eeac09f80660edc7a602b369125f",
                  "status": "affected",
                  "version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
                  "versionType": "git"
                },
                {
                  "lessThan": "d00d4470bf8c4282617a3a10e76b20a9c7e4cffa",
                  "status": "affected",
                  "version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
                  "versionType": "git"
                },
                {
                  "lessThan": "e48b211c4c59062cb6dd6c2c37c51a7cc235a464",
                  "status": "affected",
                  "version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
                  "versionType": "git"
                },
                {
                  "lessThan": "6a2fa13312e51a621f652d522d7e2df7066330b6",
                  "status": "affected",
                  "version": "04c26faa51d1e2fe71cf13c45791f5174c37f986",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d",
                  "versionType": "git"
                },
                {
                  "lessThan": "5.4.287",
                  "status": "affected",
                  "version": "5.4.124",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.10.231",
                  "status": "affected",
                  "version": "5.10.42",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.13",
                  "status": "affected",
                  "version": "5.12.9",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/tipc/udp_media.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.13"
                },
                {
                  "lessThan": "5.13",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.287",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.231",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.174",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.120",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.66",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.287",
                      "versionStartIncluding": "5.4.124",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.231",
                      "versionStartIncluding": "5.10.42",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.174",
                      "versionStartIncluding": "5.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.120",
                      "versionStartIncluding": "5.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.66",
                      "versionStartIncluding": "5.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.5",
                      "versionStartIncluding": "5.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.13",
                      "versionStartIncluding": "5.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "5.12.9",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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)-\u003ewq_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\u0027s 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"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerability is reached through generic netlink (TIPC_NL_BEARER_ENABLE/DISABLE) plus network-namespace teardown, both of which require local access to the machine. A remote TIPC/UDP peer cannot cause bearer teardown or netns destruction, so this is not remotely triggerable.\nAC:L - The attacker controls both sides of the race \u2014 creating/destroying the netns and enabling/disabling up to three UDP bearers, repeatedly and in parallel \u2014 and the post-decrement window contains a sleepable free_percpu() in dst_cache_destroy() that can be stalled with attacker-generated load, so the race can be won reliably by looping.\nPR:L - At the time of this bug the TIPCv2 netlink mutators carried no GENL_ADMIN_PERM flag, so a fully unprivileged local user could enable/disable a UDP bearer (later confirmed and fixed by commit 86b0c540e2ea), and the netns teardown that arms the race is available to any user via unshare -Urn; even with the later gate, CAP_NET_ADMIN is obtainable in a user namespace.\nUI:N - The attacker performs every step itself \u2014 load the module, enable the bearer, tear down the namespace \u2014 with no action required from any other user.\nS:U - The use-after-free corrupts kernel memory and is exploited within the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The freed struct net is read after free in udp_lib_unhash() (udp table pointer, net_hash_mix), and reallocation of the net_cachep object gives the attacker control over the dereferenced contents, enabling kernel memory disclosure.\nI:H - After the struct net is freed, sock_prot_inuse_add() performs this_cpu_add() through a percpu pointer read from freed memory and udp_lib_unhash() takes a spinlock and does list removal through an attacker-influenceable table pointer, yielding a controlled write primitive suitable for privilege escalation.\nA:H - The use-after-free reliably corrupts the UDP hash slots and dereferences freed netns memory, producing kernel oops/panic (as captured by the KMSAN report), and can be triggered repeatedly by an unprivileged user."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:45:43.729Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/4e69457f9dfae67435f3ccf29008768eae860415"
            },
            {
              "url": "https://git.kernel.org/stable/c/650ee9a22d7a2de8999fac2d45983597a0c22359"
            },
            {
              "url": "https://git.kernel.org/stable/c/d2a4894f238551eae178904e7f45af87577074fd"
            },
            {
              "url": "https://git.kernel.org/stable/c/d62d5180c036eeac09f80660edc7a602b369125f"
            },
            {
              "url": "https://git.kernel.org/stable/c/d00d4470bf8c4282617a3a10e76b20a9c7e4cffa"
            },
            {
              "url": "https://git.kernel.org/stable/c/e48b211c4c59062cb6dd6c2c37c51a7cc235a464"
            },
            {
              "url": "https://git.kernel.org/stable/c/6a2fa13312e51a621f652d522d7e2df7066330b6"
            }
          ],
          "title": "tipc: Fix use-after-free of kernel socket in cleanup_bearer().",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56642",
        "datePublished": "2024-12-27T15:02:43.660Z",
        "dateReserved": "2024-12-27T15:00:39.839Z",
        "dateUpdated": "2026-08-05T11:45:43.729Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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