Improper locking in Linux kernel - CVE-2025-21672

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Main Vulnerability Database Vulnerabilities #VU103514

Improper locking in Linux kernel - CVE-2025-21672

Published: February 3, 2025


Vulnerability identifier: #VU103514
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-21672
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the afs_proc_addr_prefs_write() function in fs/afs/addr_prefs.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Ubuntu
linux-image-6.11.0-1008-realtime (Ubuntu package)
linux-image-realtime (Ubuntu package)
linux (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-azure-nvidia (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gcp (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-image-6.11.0-24-generic-64k (Ubuntu package)
linux-image-6.11.0-24-generic (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-generic-64k-hwe-24.04 (Ubuntu package)
linux-image-generic-hwe-24.04 (Ubuntu package)
linux-image-virtual-hwe-24.04 (Ubuntu package)
linux-image-6.11.0-1011-raspi (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-6.11.0-1012-aws (Ubuntu package)
linux-image-lowlatency-64k (Ubuntu package)
linux-image-6.11.0-1012-lowlatency (Ubuntu package)
linux-image-6.11.0-1012-lowlatency-64k (Ubuntu package)
linux-image-lowlatency-64k-hwe-24.04 (Ubuntu package)
linux-image-lowlatency-hwe-24.04 (Ubuntu package)
linux-image-6.11.0-1013-azure (Ubuntu package)
linux-image-6.11.0-1013-gcp (Ubuntu package)
linux-image-6.11.0-1013-gcp-64k (Ubuntu package)
linux-image-azure-fde (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-gcp-64k (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-6.11.0-1013-azure-fde (Ubuntu package)
linux-image-6.11.0-1014-oracle-64k (Ubuntu package)
linux-image-6.11.0-1014-oracle (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-oracle-64k (Ubuntu package)
linux-image-6.11.0-1020-oem (Ubuntu package)
linux-image-oem-24.04b (Ubuntu package)

How to mitigate CVE-2025-21672

Install update from vendor's website.

linux-image-6.11.0-1008-realtime (Ubuntu package) - update to Ubuntu Pro
linux-image-realtime (Ubuntu package) - update to Ubuntu Pro
linux (Ubuntu package) - addressed in versions 6.8.0-62.65, 6.8.0-62.65.1, 6.8.0-62.65.1~22.04.1, 6.8.0-1013.15, 6.8.0-1026.30, 6.8.0-1027.27, 6.8.0-1029.29, 6.8.0-1029.32, 6.8.0-1029.32.1, 6.8.0-1029.32~22.04.1, 6.8.0-1030.32, 6.8.0-1030.32+1, 6.8.0-1030.32~22.04.1, 6.8.0-1030.32~22.04.1+1
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-64.67~22.04.1
linux-azure-nvidia (Ubuntu package) - update to 6.8.0-1018.19
linux-oracle (Ubuntu package) - addressed in versions 6.8.0-1027.28, 6.8.0-1027.28~22.04.1, 6.8.0-1029.33
linux-gcp (Ubuntu package) - addressed in versions 6.8.0-1031.33, 6.8.0-1031.33~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2024.25
linux-realtime (Ubuntu package) - update to 6.8.1-1023.24
linux-image-6.11.0-24-generic-64k (Ubuntu package) - addressed in versions 6.11.0-24.24, 6.11.0-24.24~24.04.1
linux-image-6.11.0-24-generic (Ubuntu package) - addressed in versions 6.11.0-24.24, 6.11.0-24.24~24.04.1
linux-image-generic-64k (Ubuntu package) - update to 6.11.0-24.24+1
linux-image-generic (Ubuntu package) - update to 6.11.0-24.24+1
linux-image-virtual (Ubuntu package) - update to 6.11.0-24.24+1
linux-image-generic-64k-hwe-24.04 (Ubuntu package) - update to 6.11.0-24.24~24.04.1
linux-image-generic-hwe-24.04 (Ubuntu package) - update to 6.11.0-24.24~24.04.1
linux-image-virtual-hwe-24.04 (Ubuntu package) - update to 6.11.0-24.24~24.04.1
linux-image-6.11.0-1011-raspi (Ubuntu package) - update to 6.11.0-1011.11
linux-image-raspi (Ubuntu package) - update to 6.11.0-1011.11
linux-image-aws (Ubuntu package) - update to 6.11.0-1012.13
linux-image-lowlatency (Ubuntu package) - update to 6.11.0-1012.13
linux-image-6.11.0-1012-aws (Ubuntu package) - update to 6.11.0-1012.13
linux-image-lowlatency-64k (Ubuntu package) - update to 6.11.0-1012.13
linux-image-6.11.0-1012-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1012.13, 6.11.0-1012.13~24.04.1
linux-image-6.11.0-1012-lowlatency-64k (Ubuntu package) - addressed in versions 6.11.0-1012.13, 6.11.0-1012.13~24.04.1
linux-image-lowlatency-64k-hwe-24.04 (Ubuntu package) - update to 6.11.0-1012.13~24.04.1
linux-image-lowlatency-hwe-24.04 (Ubuntu package) - update to 6.11.0-1012.13~24.04.1
linux-image-6.11.0-1013-azure (Ubuntu package) - addressed in versions 6.11.0-1013.13, 6.11.0-1013.13~24.04.1
linux-image-6.11.0-1013-gcp (Ubuntu package) - update to 6.11.0-1013.13
linux-image-6.11.0-1013-gcp-64k (Ubuntu package) - update to 6.11.0-1013.13
linux-image-azure-fde (Ubuntu package) - addressed in versions 6.11.0-1013.13, 6.11.0-1013.13~24.04.1
linux-image-azure (Ubuntu package) - addressed in versions 6.11.0-1013.13, 6.11.0-1013.13~24.04.1
linux-image-gcp-64k (Ubuntu package) - update to 6.11.0-1013.13
linux-image-gcp (Ubuntu package) - update to 6.11.0-1013.13
linux-image-6.11.0-1013-azure-fde (Ubuntu package) - addressed in versions 6.11.0-1013.13, 6.11.0-1013.13~24.04.1
linux-image-6.11.0-1014-oracle-64k (Ubuntu package) - update to 6.11.0-1014.15
linux-image-6.11.0-1014-oracle (Ubuntu package) - update to 6.11.0-1014.15
linux-image-oracle (Ubuntu package) - update to 6.11.0-1014.15
linux-image-oracle-64k (Ubuntu package) - update to 6.11.0-1014.15
linux-image-6.11.0-1020-oem (Ubuntu package) - update to 6.11.0-1020.20
linux-image-oem-24.04b (Ubuntu package) - update to 6.11.0-1020.20

External References

Related Security Bulletins