CVE-2025-21846 (GCVE-0-2025-21846)

Vulnerability from cvelistv5 – Published: 2025-03-12 09:42 – Updated: 2025-11-03 19:38
VLAI?
Title
acct: perform last write from workqueue
Summary
In the Linux kernel, the following vulnerability has been resolved: acct: perform last write from workqueue In [1] it was reported that the acct(2) system call can be used to trigger NULL deref in cases where it is set to write to a file that triggers an internal lookup. This can e.g., happen when pointing acc(2) to /sys/power/resume. At the point the where the write to this file happens the calling task has already exited and called exit_fs(). A lookup will thus trigger a NULL-deref when accessing current->fs. Reorganize the code so that the the final write happens from the workqueue but with the caller's credentials. This preserves the (strange) permission model and has almost no regression risk. This api should stop to exist though.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b03782ae707cc45e65242c7cddd8e28f1c22cde5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d5b936cfa4b0d5670ca7420ef165a074bc008eb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5ee8da9bea70dda492d61f075658939af33d8410 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5c928e14a2ccd99462f2351ead627b58075bb736 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5a59ced8ffc71973d42c82484a719c8f6ac8f7f7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a8136afca090412a36429cb6c2543c714d9c0f84 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 56d5f3eba3f5de0efdd556de4ef381e109b973a9 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.130 , ≤ 6.1.* (semver)
Unaffected: 6.6.80 , ≤ 6.6.* (semver)
Unaffected: 6.12.17 , ≤ 6.12.* (semver)
Unaffected: 6.13.5 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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This can e.g., happen when pointing acc(2)\\nto /sys/power/resume. At the point the where the write to this file\\nhappens the calling task has already exited and called exit_fs(). A\\nlookup will thus trigger a NULL-deref when accessing current-\u003efs.\\n\\nReorganize the code so that the the final write happens from the\\nworkqueue but with the caller\u0027s credentials. This preserves the\\n(strange) permission model and has almost no regression risk.\\n\\nThis api should stop to exist though.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.291\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.235\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.130\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.80\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.17\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.5\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:22:26.364Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21846\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T19:38:03.560Z\", \"dateReserved\": \"2024-12-29T08:45:45.778Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-12T09:42:02.635Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.