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              "value": "AV:A - The vulnerability is in the Bluetooth HCI event path (hci_disconn_phylink_complete_evt), reachable from an adjacent Bluetooth peer/controller that induces HCI_EV_DISCONN_PHY_LINK_COMPLETE, matching kernel guidance that Bluetooth bugs are Adjacent.\nAC:L - The attacker can reliably trigger the bug by causing a DISCONN_PHY_LINK_COMPLETE event whose phy_handle matches an existing non-AMP connection handle; no uncontrolled race or special victim state is required beyond an active L2CAP/LE connection.\nPR:N - Exploitation does not require local privileges on the victim; an unauthenticated adjacent Bluetooth attacker can drive the HCI event path that frees the connection object, consistent with other Bluetooth HCI UAF scores.\nUI:N - No user interaction is required; once Bluetooth is up and a connection exists, the malicious HCI disconnect event and subsequent send path trigger the UAF without victim action.\nS:U - Impact is confined to the local kernel Bluetooth stack (memory corruption/privilege escalation within the same OS authority), with no VM escape or other security-authority boundary crossed.\nC:H - This is a heap use-after-free of hci_chan; per guidance UAFs enable control of freed object contents and arbitrary read primitives, so confidentiality impact is High.\nI:H - The same UAF of hci_chan used by hci_send_acl enables heap spraying and write/control-flow hijacking primitives, so integrity impact is High.\nA:H - The demonstrated KASAN use-after-free causes kernel oops/crash on the send path, and UAFs are scored High for availability even when not fully exploited."
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          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
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        "title": "CVE Program Container"
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    "cna": {
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          "programFiles": [
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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                  "versionEndExcluding": "5.4.287",
                  "versionStartIncluding": "5.4.124",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.231",
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                  "vulnerable": true
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      "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."
            }
          ]
        }
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      "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"
        }
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      "title": "tipc: Fix use-after-free of kernel socket in cleanup_bearer().",
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  "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"
}