CVE-2023-54088: blk-cgroup: hold queue_lock when removing blkg->q_node

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-24 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: hold queue_lock when removing blkg->q_node When blkg is removed from q->blkg_list from blkg_free_workfn(), queue_lock has to be held, otherwise, all kinds of bugs(list corruption, hard lockup, ..) can be triggered from blkg_destroy_all().

Affected products

Linux kernel: from 6.1.16 before 6.1.17; from 6.2.3 before 6.2.4; 6.3 — fixed in 6.1.17, 6.2.4, 6.5

How to fix

Upgrade to a fixed version: Linux kernel 6.1.17, 6.2.4, 6.5. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df
https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc
https://git.kernel.org/stable/c/c164c7bc9775be7bcc68754bb3431fce5823822e
https://git.kernel.org/stable/c/cd4ffdf56791eec95af01f06bee1ec7665ca75c4

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