github - ghsa-jfr9-726h-gv8r

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: 2025-05-04 07:21

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

CWE

CWE-416 - Use After Free

Assigner

Linux

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

Vendor

Product

Version

Linux

Affected: 68f83057b913467a999e1bf9e0da6a119668f769 , < e7c16028a424dd35be1064a68fa318be4359310f (git)
Affected: 68f83057b913467a999e1bf9e0da6a119668f769 , < 835b69c868f53f959d4986bbecd561ba6f38e492 (git)
Affected: 68f83057b913467a999e1bf9e0da6a119668f769 , < e76946110137703c16423baf6ee177b751a34b7e (git)

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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JSON

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        "metrics": [
          {
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              "attackVector": "LOCAL",
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              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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                "options": [
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T18:14:15.335144Z",
                "version": "2.0.3"
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        }
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    "datePublished": "2025-02-27T02:18:26.406Z",
    "dateReserved": "2024-12-29T08:45:45.765Z",
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}

Sightings

Author	Source	Type	Date

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