exit: prevent preemption of oopsing TASK_DEAD task_CVE-2026-46173

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nexit: prevent preemption of oopsing TASK_DEAD task\n\nWhen an already-exiting task oopses, make_task_dead() currently calls\ndo_task_dead() with preemption enabled.  That is forbidden:\ndo_task_dead() calls __schedule(), which has a comment saying \"WARNING:\nmust be called with preemption disabled!\".\n\nIf an oopsing task is preempted in do_task_dead(), between becoming\nTASK_DEAD and entering the scheduler explicitly, bad things happen:\nfinish_task_switch() assumes that once the scheduler has switched away\nfrom a TASK_DEAD task, the task can never run again and its stack is no\nlonger needed; but that assumption apparently doesn't hold if the dead\ntask was preempted (the SM_PREEMPT case).\n\nThis means that the scheduler ends up repeatedly dropping references on\nthe dead task's stack, which can lead to use-after-free or double-free\nof the entire task stack; in other words, two tasks can end up running\non the same stack, resulting in various kinds of memory corruption.\n\n(This does not just affect \"recursively oopsing\" tasks; it is enough to\noops once during task exit, for example in a file_operations::release\nhandler)",
    "published": "2026-05-28T09:36:27.892Z",
    "modified": "2026-05-30T10:48:36.533Z",
    "type": "cve",
    "title": "exit: prevent preemption of oopsing TASK_DEAD task",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/640b4c00fb0e2920327435f6176cbefc3c546165\nhttps://git.kernel.org/stable/c/7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34\nhttps://git.kernel.org/stable/c/6f49f94f3b11fe8bff1bf2a054143789e76aaf17\nhttps://git.kernel.org/stable/c/9756b3db5db6c2f5eccb32dddbd88eb4c54f575e\nhttps://git.kernel.org/stable/c/c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891",
    "id": "CVE-2026-46173",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 7f80a2fd7db9a55894fd841915236aca611291b5\nLinux Linux 7f80a2fd7db9a55894fd841915236aca611291b5\nLinux Linux 7f80a2fd7db9a55894fd841915236aca611291b5\nLinux Linux 7f80a2fd7db9a55894fd841915236aca611291b5\nLinux Linux 7f80a2fd7db9a55894fd841915236aca611291b5\nLinux Linux 5.17",
    "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": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "7f80a2fd7db9a55894fd841915236aca611291b5",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}