{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3197542482df22c2a131d4a813280bd7c54cedf5"
            },
            {
              "fixed": "69f98fff30bdaa72b0cb0e7e078ab6456a0a59b0"
            },
            {
              "fixed": "b35597bdae1a5d8395da4b9baa993b9b71f74d68"
            },
            {
              "fixed": "e575dabb805252e3113fdc3f56f6ecacfde422d0"
            },
            {
              "fixed": "7ff42312ccde549f8c698723822c7db35107a39b"
            },
            {
              "fixed": "a3d85dec60bb0622360fc176b2a51abdbe2ff0ad"
            },
            {
              "fixed": "fe997a84a385f840b593ead92e575503a5046cee"
            },
            {
              "fixed": "c5186201fa7030289cc4fe23fae87a3fcb566856"
            },
            {
              "fixed": "c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.10.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64435.json"
  },
  "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() → __skb_unlink() path with WRITE_ONCE()\nprotected by a spinlock. This constitutes data races.\n\nAll affected skb_queue_len(\u0026audit_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 -\u003e 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]",
  "id": "CVE-2026-64435",
  "modified": "2026-07-28T03:55:49.422238674Z",
  "published": "2026-07-25T08:51:09.688Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69f98fff30bdaa72b0cb0e7e078ab6456a0a59b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ff42312ccde549f8c698723822c7db35107a39b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3d85dec60bb0622360fc176b2a51abdbe2ff0ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b35597bdae1a5d8395da4b9baa993b9b71f74d68"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5186201fa7030289cc4fe23fae87a3fcb566856"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9a71daaecb2fb1d8c704545cc0b1c920b9bf5d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e575dabb805252e3113fdc3f56f6ecacfde422d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe997a84a385f840b593ead92e575503a5046cee"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64435.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64435"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "audit: Fix data races of skb_queue_len() readers on audit_queue"
}