rtmutex: Use waiter::task instead of current in remove_waiter()_CVE-2026-43499

{
    "lastseen": "",
    "description": "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 ]",
    "published": "2026-05-21T12:17:49.281Z",
    "modified": "2026-05-30T10:45:19.197Z",
    "type": "cve",
    "title": "rtmutex: Use waiter::task instead of current in remove_waiter()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f\nhttps://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166\nhttps://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2\nhttps://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11\nhttps://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349",
    "id": "CVE-2026-43499",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 8161239a8bcce9ad6b537c04a1fa3b5c68bae693\nLinux Linux 8161239a8bcce9ad6b537c04a1fa3b5c68bae693\nLinux Linux 8161239a8bcce9ad6b537c04a1fa3b5c68bae693\nLinux Linux 8161239a8bcce9ad6b537c04a1fa3b5c68bae693\nLinux Linux 8161239a8bcce9ad6b537c04a1fa3b5c68bae693\nLinux Linux 2.6.39",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "8161239a8bcce9ad6b537c04a1fa3b5c68bae693",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}