{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64435",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64435"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "audit: Fix data races of skb_queue_len() readers on audit_queue",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naudit: Fix data races of skb_queue_len() readers on audit_queue\n\nMultiple readers access audit_queue.qlen via skb_queue_len() without\nholding the queue lock or using READ_ONCE(), while kauditd writes to\nthis field via the skb_dequeue() \u2192 __skb_unlink() path with WRITE_ONCE()\nprotected by a spinlock. This constitutes data races.\n\nAll affected skb_queue_len(&audit_queue) call sites:\n  - kauditd_thread() wait_event_freezable() condition\n  - audit_receive_msg() AUDIT_GET handler (s.backlog assignment)\n  - audit_receive() backlog check\n  - audit_log_start() backlog check and pr_warn()\n\nKCSAN reports the following conflicting access pattern (one example):\n==================================================================\nBUG: KCSAN: data-race in audit_log_start / skb_dequeue\n\nwrite (marked) to 0xffffffff8512ee20 of 4 bytes by task 661 on cpu 57:\n skb_dequeue+0x70/0xf0\n kauditd_send_queue+0x71/0x220\n kauditd_thread+0x1cb/0x430\n kthread+0x1c2/0x210\n ret_from_fork+0x162/0x1a0\n ret_from_fork_asm+0x1a/0x30\n\nread to 0xffffffff8512ee20 of 4 bytes by task 36586 on cpu 1:\n audit_log_start+0x2a0/0x6b0\n audit_core_dumps+0x64/0xa0\n do_coredump+0x14b/0x1260\n get_signal+0xeb2/0xf70\n arch_do_signal_or_restart+0x41/0x170\n exit_to_user_mode_loop+0xa2/0x1c0\n do_syscall_64+0x1a3/0x1c0\n entry_SYSCALL_64_after_hwframe+0x76/0xe0\n\nvalue changed: 0x00000001 -> 0x00000000\n==================================================================\n\nResolve the race by switching to lockless helper skb_queue_len_lockless(),\nwhich internally uses READ_ONCE() and properly pairs with the WRITE_ONCE()\nwrite accesses already present on the writer side.\n\n[PM: line length tweak]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b35597bdae1a5d8395da4b9baa993b9b71f74d68"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e575dabb805252e3113fdc3f56f6ecacfde422d0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ff42312ccde549f8c698723822c7db35107a39b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3d85dec60bb0622360fc176b2a51abdbe2ff0ad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fe997a84a385f840b593ead92e575503a5046cee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c5186201fa7030289cc4fe23fae87a3fcb566856"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.2,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - Unauthenticated packets matching a pre-existing nftables audit-level logging or xtables AUDIT rule reach audit_log_start() through the network receive and netfilter paths.\nAC:L - Parallel matching traffic invokes the vulnerable readers while feeding and waking kauditd, allowing the attacker to repeatedly drive both sides of the race.\nPR:N - The audit rule must already be configured, but the remote attacker needs no credentials or capabilities to send matching packets.\nUI:N - No victim action is required after the affected network-audit configuration is active.\nS:U - The race and its effects remain within the host kernel and its audit security authority.\nC:N - The raced value is only the 32-bit queue length; no pointer, packet contents, or adjacent memory is disclosed.\nI:L - An incorrect backlog decision can delay or discard audit records, causing limited corruption of the security audit trail without an arbitrary-write primitive.\nA:H - In hardened systems using AUDIT_FAIL_PANIC, a raced queue length interpreted as exceeding the limit from the GFP_ATOMIC packet-audit path calls audit_log_lost() and can panic the kernel."
    }
  }
}