CVE-2025-21846

Advisory lineage Upstream: 0 Downstream: 58
Modified
Published: 12 Mar 2025, 09:42
Last modified:12 May 2026, 12:04

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (cve.org)
EPSS Score
0.21% LOW
0% probability +0.16%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

12 Mar 2025, 09:42
Published
Vulnerability first disclosed
12 May 2026, 12:04
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.21%• Percentile: 11%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • linux•linux

    ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8acbf4a88c6a98c8ed00afd1a7d1abcca9b4735e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b03782ae707cc45e65242c7cddd8e28f1c22cde5 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5d5b936cfa4b0d5670ca7420ef165a074bc008eb | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5ee8da9bea70dda492d61f075658939af33d8410 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5c928e14a2ccd99462f2351ead627b58075bb736 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5a59ced8ffc71973d42c82484a719c8f6ac8f7f7 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a8136afca090412a36429cb6c2543c714d9c0f84 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 56d5f3eba3f5de0efdd556de4ef381e109b973a9 | 2.6.12

  • linux•linux_kernel

    ≥ 2.6.12, < 6.1.130 | ≥ 6.2, < 6.6.80 | ≥ 6.7, < 6.12.17 | ≥ 6.13, < 6.13.5 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3

References (11)