CVE-2026-46173 (GCVE-0-2026-46173)
Vulnerability from cvelistv5
Published
2026-05-28 09:36
Modified
2026-06-17 06:15
Summary
In the Linux kernel, the following vulnerability has been resolved: exit: prevent preemption of oopsing TASK_DEAD task When an already-exiting task oopses, make_task_dead() currently calls do_task_dead() with preemption enabled. That is forbidden: do_task_dead() calls __schedule(), which has a comment saying "WARNING: must be called with preemption disabled!". If an oopsing task is preempted in do_task_dead(), between becoming TASK_DEAD and entering the scheduler explicitly, bad things happen: finish_task_switch() assumes that once the scheduler has switched away from a TASK_DEAD task, the task can never run again and its stack is no longer needed; but that assumption apparently doesn't hold if the dead task was preempted (the SM_PREEMPT case). This means that the scheduler ends up repeatedly dropping references on the dead task's stack, which can lead to use-after-free or double-free of the entire task stack; in other words, two tasks can end up running on the same stack, resulting in various kinds of memory corruption. (This does not just affect "recursively oopsing" tasks; it is enough to oops once during task exit, for example in a file_operations::release handler)
Impacted products
Vendor Product Version
Linux Linux Version: 7f80a2fd7db9a55894fd841915236aca611291b5
Version: 7f80a2fd7db9a55894fd841915236aca611291b5
Version: 7f80a2fd7db9a55894fd841915236aca611291b5
Version: 7f80a2fd7db9a55894fd841915236aca611291b5
Version: 7f80a2fd7db9a55894fd841915236aca611291b5
Version: 7f80a2fd7db9a55894fd841915236aca611291b5
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          "value": "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\u0027t 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\u0027s 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)"
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-06-17T06:15:31.395Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3d6fb8a7690c23e3213c4b008f64d89a44b98737"
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          "url": "https://git.kernel.org/stable/c/640b4c00fb0e2920327435f6176cbefc3c546165"
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        },
        {
          "url": "https://project-zero.issues.chromium.org/issues/510793286"
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      ],
      "title": "exit: prevent preemption of oopsing TASK_DEAD task",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46173",
    "datePublished": "2026-05-28T09:36:27.892Z",
    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-06-17T06:15:31.395Z",
    "state": "PUBLISHED"
  },
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}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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