Vulnerability-Lookup

GHSA-MPR4-2MM3-RWM6

Vulnerability from github – Published: 2026-05-28 12:30 – Updated: 2026-05-28 12:30

Details

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)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46173"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T10:16:32Z",
    "severity": null
  },
  "details": "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)",
  "id": "GHSA-mpr4-2mm3-rwm6",
  "modified": "2026-05-28T12:30:31Z",
  "published": "2026-05-28T12:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46173"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/640b4c00fb0e2920327435f6176cbefc3c546165"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f49f94f3b11fe8bff1bf2a054143789e76aaf17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9756b3db5db6c2f5eccb32dddbd88eb4c54f575e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46173 (GCVE-0-2026-46173)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-05-28 09:36

Title

exit: prevent preemption of oopsing TASK_DEAD task

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)

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/640b4c00fb0e29203…
https://git.kernel.org/stable/c/7b2800ba5f5f77a8e…
https://git.kernel.org/stable/c/6f49f94f3b11fe8bf…
https://git.kernel.org/stable/c/9756b3db5db6c2f5e…
https://git.kernel.org/stable/c/c1fa0bb633e4a6b11…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7f80a2fd7db9a55894fd841915236aca611291b5 , < 640b4c00fb0e2920327435f6176cbefc3c546165 (git) Affected: 7f80a2fd7db9a55894fd841915236aca611291b5 , < 7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34 (git) Affected: 7f80a2fd7db9a55894fd841915236aca611291b5 , < 6f49f94f3b11fe8bff1bf2a054143789e76aaf17 (git) Affected: 7f80a2fd7db9a55894fd841915236aca611291b5 , < 9756b3db5db6c2f5eccb32dddbd88eb4c54f575e (git) Affected: 7f80a2fd7db9a55894fd841915236aca611291b5 , < c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1-rc4 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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              "versionType": "semver"
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            {
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              "status": "unaffected",
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            },
            {
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              "status": "unaffected",
              "version": "7.1-rc4",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
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                {
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        {
          "url": "https://git.kernel.org/stable/c/c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891"
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      "title": "exit: prevent preemption of oopsing TASK_DEAD task",
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    "datePublished": "2026-05-28T09:36:27.892Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-MPR4-2MM3-RWM6

CVE-2026-46173 (GCVE-0-2026-46173)

Tags

Sightings

Nomenclature