CVE-2023-53292

blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

State: Published
Severity: 5.5 Medium
Published: Sep 16, 2025
Updated: Oct 15, 2026
Reserved: Sep 16, 2025

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Description

In the Linux kernel, the following vulnerability has been resolved:

blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

After grabbing q->sysfs_lock, q->elevator may become NULL because of elevator switch.

Fix the NULL dereference on q->elevator by checking it with lock.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	5fd7a84a09e640016fe106dd3e992f5210e23dc7 to before 988ddb77218d3975dd13dee7bb0e1fae098a9fdbAffected 5fd7a84a09e640016fe106dd3e992f5210e23dc7 to before 3e977386521b71471e66ec2ba82efdfcc456adf2Affected 5fd7a84a09e640016fe106dd3e992f5210e23dc7 to before 245165658e1c9f95c0fecfe02b9b1ebd30a1198aAffected
LinuxLinux	5.19Affected before 5.19Not affected 6.1.175 through 6.1.Not affected 6.4.7 through 6.4.Not affected 6.5 and laterNot affected

References

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