{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53005",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53005"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "af_unix: Drop all SCM attributes for SOCKMAP.",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Drop all SCM attributes for SOCKMAP.\n\nSOCKMAP can hide inflight fd from AF_UNIX GC.\n\nWhen a socket in SOCKMAP receives skb with inflight fd,\nsk_psock_verdict_data_ready() looks up the mapped socket and\nenqueue skb to its psock->ingress_skb.\n\nSince neither the old nor the new GC can inspect the psock\nqueue, the hidden skb leaks the inflight sockets.  Note that\nthis cannot be detected via kmemleak because inflight sockets\nare linked to a global list.\n\nIn addition, SOCKMAP redirect breaks the Tarjan-based GC's\nassumption that unix_edge.successor is always alive, which\nis no longer true once skb is redirected, resulting in\nuse-after-free below. [0]\n\nMoreover, SOCKMAP does not call scm_stat_del() properly,\nso unix_show_fdinfo() could report an incorrect fd count.\n\nsk_msg_recvmsg() does not support any SCM attributes in the\nfirst place.\n\nLet's drop all SCM attributes before passing skb to the\nSOCKMAP layer.\n\n[0]:\nBUG: KASAN: slab-use-after-free in unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\nRead of size 8 at addr ffff888125362670 by task kworker/56:1/496\n\nCPU: 56 UID: 0 PID: 496 Comm: kworker/56:1 Not tainted 7.0.0-rc7-00263-gb9d8b856689d #3 PREEMPT(lazy)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\nWorkqueue: events sk_psock_backlog\nCall Trace:\n <TASK>\n dump_stack_lvl (lib/dump_stack.c:122)\n print_report (mm/kasan/report.c:379)\n kasan_report (mm/kasan/report.c:597)\n unix_del_edges (net/unix/garbage.c:118 net/unix/garbage.c:181 net/unix/garbage.c:251)\n unix_destroy_fpl (net/unix/garbage.c:317)\n unix_destruct_scm (./include/net/scm.h:80 ./include/net/scm.h:86 net/unix/af_unix.c:1976)\n sk_psock_backlog (./include/linux/skbuff.h:?)\n process_scheduled_works (kernel/workqueue.c:?)\n worker_thread (kernel/workqueue.c:?)\n kthread (kernel/kthread.c:438)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)\n </TASK>\n\nAllocated by task 955:\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\n __kasan_slab_alloc (mm/kasan/common.c:369)\n kmem_cache_alloc_noprof (mm/slub.c:4539)\n sk_prot_alloc (net/core/sock.c:2240)\n sk_alloc (net/core/sock.c:2301)\n unix_create1 (net/unix/af_unix.c:1099)\n unix_create (net/unix/af_unix.c:1169)\n __sock_create (net/socket.c:1606)\n __sys_socketpair (net/socket.c:1811)\n __x64_sys_socketpair (net/socket.c:1863 net/socket.c:1860 net/socket.c:1860)\n do_syscall_64 (arch/x86/entry/syscall_64.c:?)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFreed by task 496:\n kasan_save_track (mm/kasan/common.c:58 mm/kasan/common.c:78)\n kasan_save_free_info (mm/kasan/generic.c:587)\n __kasan_slab_free (mm/kasan/common.c:287)\n kmem_cache_free (mm/slub.c:6165)\n __sk_destruct (net/core/sock.c:2282 net/core/sock.c:2384)\n sk_psock_destroy (./include/net/sock.h:?)\n process_scheduled_works (kernel/workqueue.c:?)\n worker_thread (kernel/workqueue.c:?)\n kthread (kernel/kthread.c:438)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:258)",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53005"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/866e69a824b46e682b8fb923be321b585e634874"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/301bdc558a5eb4057473204d35e2608e682aaafb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/48c41cd2e04af4b2cdef19e2d00994ae82952f14"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e0a71cbf0c1906a2eccbe69dd7d7f36fd1511d66"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b34a1d83c74a124c968b5adb25c809db3e2eb86a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/965dc93481d1b80d341bdd16c27b16fe197175ee"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable AF_UNIX SOCKMAP path is reached through local syscalls such as bpf(), socketpair(), map update/attach, and sendmsg() with SCM_RIGHTS; remote network peers cannot pass AF_UNIX file descriptors into this path.\nAC:L - The attacker can create the sockets, install the SOCKMAP verdict redirect, send SCM_RIGHTS, and close/tear down the involved sockets; any timing involved is under attacker control.\nPR:L - Triggering requires creating/attaching SK_SKB SOCKMAP BPF objects, gated by CAP_BPF/CAP_NET_ADMIN or delegated BPF token access. In a reasonable namespaced/delegated BPF deployment this is low privilege rather than host-root-only.\nUI:N - No victim action is required after the attacker has local access and the needed BPF privileges; the trigger is entirely attacker-driven.\nS:U - The vulnerability is in the host kernel AF_UNIX/SOCKMAP implementation and impacts the same kernel security authority. This is standard kernel memory corruption/DoS rather than a hypervisor or device isolation boundary escape.\nC:H - The bug produces a use-after-free on AF_UNIX socket/SCM graph state after SOCKMAP hides redirected skb SCM attributes. Per kernel scoring guidance, UAF memory corruption is treated as capable of high confidentiality impact.\nI:H - The freed socket/graph state can be reused while kernel GC follows stale pointers, making this memory corruption potentially exploitable beyond a simple crash. Per guidance, UAF is scored as high integrity impact.\nA:H - The reported failure is a KASAN slab-use-after-free in AF_UNIX GC/workqueue processing, and the hidden inflight-fd skb state can also leak socket references. This can cause kernel oops/panic or sustained resource exhaustion."
    }
  }
}