PT-2025-4353 · Linux+8 · Linux Kernel+8
Syzbot
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Published
2025-01-07
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Updated
2026-05-26
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CVE-2025-21672
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.12.10
Description
The issue is related to incorrect locking of resources in the fs/afs/addr prefs.c module of the Linux kernel. This can lead to a denial of service. The problem occurs when the function returns directly without releasing the held inode lock if argc is less than 0. To fix this, the error is stored in ret and the function jumps to done to clean up instead of returning directly. The
afs split string() function's error code is also taken into account.Recommendations
For Linux kernel versions prior to 6.12.10, update to a version that includes the fix for the merge preference rule failure condition to resolve the issue. As a temporary workaround, consider restricting access to the vulnerable
afs proc addr prefs write function until a patch is available.Exploit
Fix
DoS
Improper Locking
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Hat
Rocky Linux
Ubuntu