Bug 2414500 (CVE-2025-40146) - CVE-2025-40146 kernel: blk-mq: fix potential deadlock while nr_requests grown
Summary: CVE-2025-40146 kernel: blk-mq: fix potential deadlock while nr_requests grown
Keywords:
Status: NEW
Alias: CVE-2025-40146
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-11-12 11:03 UTC by OSIDB Bzimport
Modified: 2025-11-13 14:21 UTC (History)
0 users

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Description OSIDB Bzimport 2025-11-12 11:03:50 UTC 
In the Linux kernel, the following vulnerability has been resolved:

blk-mq: fix potential deadlock while nr_requests grown

Allocate and free sched_tags while queue is freezed can deadlock[1],
this is a long term problem, hence allocate memory before freezing
queue and free memory after queue is unfreezed.

[1] https://lore.kernel.org/all/0659ea8d-a463-47c8-9180-43c719e106eb@linux.ibm.com/
Comment 1 Alexander B 2025-11-13 14:19:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111256-CVE-2025-40146-b919@gregkh/T
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