Bug 2425095 (CVE-2023-54088)

Summary: CVE-2023-54088 kernel: blk-cgroup: hold queue_lock when removing blkg->q_node
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A locking flaw was found in the Linux kernel's block cgroup subsystem. When removing blkg->q_node from q->blkg_list in blkg_free_workfn(), the code fails to hold queue_lock. This missing lock allows concurrent access from blkg_destroy_all(), leading to list corruption and potential hard lockups.
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Description OSIDB Bzimport 2025-12-24 14:02:26 UTC 
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().
Comment 1 Alexander B 2025-12-25 03:01:44 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122406-CVE-2023-54088-f00f@gregkh/T