{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693"
            },
            {
              "fixed": "d8cce4773c2b23d819baf5abedc62f7b430e8745"
            },
            {
              "fixed": "8a1fc8d698ac5e5916e3082a0f74450d71f9611f"
            },
            {
              "fixed": "6d52dfcb2a5db86e346cf51f8fcf2071b8085166"
            },
            {
              "fixed": "3fb7394a837740770f0d6b4b30567e60786a63f2"
            },
            {
              "fixed": "88614876370aac8ad1050ad785a4c095ba17ac11"
            },
            {
              "fixed": "3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.39"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.140"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.86"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.27"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43499.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtmutex: Use waiter::task instead of current in remove_waiter()\n\nremove_waiter() is used by the slowlock paths, but it is also used for\nproxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from\nfutex_requeue().\n\nIn the latter case waiter::task is not current, but remove_waiter()\noperates on current for the dequeue operation. That results in several\nproblems:\n\n  1) the rbtree dequeue happens without waiter::task::pi_lock being held\n\n  2) the waiter task's pi_blocked_on state is not cleared, which leaves a\n     dangling pointer primed for UAF around.\n\n  3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter\n     task\n\nUse waiter::task instead of current in all related operations in\nremove_waiter() to cure those problems.\n\n[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the\n  \tchangelog ]",
  "id": "CVE-2026-43499",
  "modified": "2026-07-08T05:38:17.846306175Z",
  "published": "2026-05-21T12:17:49.281Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43499.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43499"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rtmutex: Use waiter::task instead of current in remove_waiter()"
}