Vulnerability-Lookup

GHSA-JFR9-726H-GV8R

Vulnerability from github – Published: 2025-02-27 03:34 – Updated: 2025-02-27 21:32

Details

In the Linux kernel, the following vulnerability has been resolved:

workqueue: Put the pwq after detaching the rescuer from the pool

The commit 68f83057b913("workqueue: Reap workers via kthread_stop() and remove detach_completion") adds code to reap the normal workers but mistakenly does not handle the rescuer and also removes the code waiting for the rescuer in put_unbound_pool(), which caused a use-after-free bug reported by Cheung Wall.

To avoid the use-after-free bug, the pool’s reference must be held until the detachment is complete. Therefore, move the code that puts the pwq after detaching the rescuer from the pool.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21786"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-27T03:15:19Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Put the pwq after detaching the rescuer from the pool\n\nThe commit 68f83057b913(\"workqueue: Reap workers via kthread_stop() and\nremove detach_completion\") adds code to reap the normal workers but\nmistakenly does not handle the rescuer and also removes the code waiting\nfor the rescuer in put_unbound_pool(), which caused a use-after-free bug\nreported by Cheung Wall.\n\nTo avoid the use-after-free bug, the pool\u2019s reference must be held until\nthe detachment is complete. Therefore, move the code that puts the pwq\nafter detaching the rescuer from the pool.",
  "id": "GHSA-jfr9-726h-gv8r",
  "modified": "2025-02-27T21:32:15Z",
  "published": "2025-02-27T03:34:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21786"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/835b69c868f53f959d4986bbecd561ba6f38e492"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e76946110137703c16423baf6ee177b751a34b7e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7c16028a424dd35be1064a68fa318be4359310f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-21786 (GCVE-0-2025-21786)

Vulnerability from cvelistv5 – Published: 2025-02-27 02:18 – Updated: 2026-05-11 21:06

Title

workqueue: Put the pwq after detaching the rescuer from the pool

Summary

In the Linux kernel, the following vulnerability has been resolved: workqueue: Put the pwq after detaching the rescuer from the pool The commit 68f83057b913("workqueue: Reap workers via kthread_stop() and remove detach_completion") adds code to reap the normal workers but mistakenly does not handle the rescuer and also removes the code waiting for the rescuer in put_unbound_pool(), which caused a use-after-free bug reported by Cheung Wall. To avoid the use-after-free bug, the pool’s reference must be held until the detachment is complete. Therefore, move the code that puts the pwq after detaching the rescuer from the pool.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/e7c16028a424dd35b…
https://git.kernel.org/stable/c/835b69c868f53f959…
https://git.kernel.org/stable/c/e76946110137703c1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 68f83057b913467a999e1bf9e0da6a119668f769 , < e7c16028a424dd35be1064a68fa318be4359310f (git) Affected: 68f83057b913467a999e1bf9e0da6a119668f769 , < 835b69c868f53f959d4986bbecd561ba6f38e492 (git) Affected: 68f83057b913467a999e1bf9e0da6a119668f769 , < e76946110137703c16423baf6ee177b751a34b7e (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.16 , ≤ 6.12.* (semver) Unaffected: 6.13.4 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix)

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          {
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              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
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              "confidentialityImpact": "HIGH",
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              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T18:14:15.335144Z",
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    "datePublished": "2025-02-27T02:18:26.406Z",
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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-JFR9-726H-GV8R

CVE-2025-21786 (GCVE-0-2025-21786)

Tags

Sightings

Nomenclature