PT-2025-4312 · Linux+9 · Linux Kernel+9
Published
2025-01-09
·
Updated
2026-02-18
·
CVE-2025-21631
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.6.74
Description
A use-after-free vulnerability has been resolved in the Linux kernel. The issue is related to the
bfq init rq function in the block/bfq-iosched.c file, where a slab-use-after-free error occurs. The vulnerability was reported by syzkaller for Linux kernel version 6.6. The estimated number of potentially affected devices is not provided. There is no information about real-world incidents where this issue was exploited.Recommendations
To resolve the issue, update the Linux kernel to version 6.6.74 or later. As a temporary workaround, consider disabling the
bfq init rq function until a patch is available. Restrict access to the vulnerable block/bfq-iosched.c module to minimize the risk of exploitation. Avoid using the bfq get queue function in the affected API endpoint until the issue is resolved.Exploit
Fix
Use After Free
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Linuxmint
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu