Riskcovery

CVE-2025-21846

acct: perform last write from workqueue

State
Published
Severity
5.5 Medium
Published
Mar 12, 2025
Updated
Oct 15, 2026
Reserved
Dec 29, 2024

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.15.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCISA-ADP

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735eAffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before b03782ae707cc45e65242c7cddd8e28f1c22cde5Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5d5b936cfa4b0d5670ca7420ef165a074bc008ebAffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5ee8da9bea70dda492d61f075658939af33d8410Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5c928e14a2ccd99462f2351ead627b58075bb736Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5a59ced8ffc71973d42c82484a719c8f6ac8f7f7Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a8136afca090412a36429cb6c2543c714d9c0f84Affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 56d5f3eba3f5de0efdd556de4ef381e109b973a9Affected
LinuxLinux
  • 2.6.12Affected
  • before 2.6.12Not affected
  • 5.4.291 through 5.4.*Not affected
  • 5.10.235 through 5.10.*Not affected
  • 5.15.179 through 5.15.*Not affected
  • 6.1.130 through 6.1.*Not affected
  • 6.6.80 through 6.6.*Not affected
  • 6.12.17 through 6.12.*Not affected
  • 6.13.5 through 6.13.*Not affected
  • 6.14 and laterNot affected

References

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