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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-53292
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-16 08:15:38 UTC
Updated2026-06-01 17:16:24 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000190000 probability, percentile 0.054120000 (date 2026-06-04)

Problem Types: CWE-476 | CWE-476 CWE-476 NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5fd7a84a09e640016fe106dd3e992f5210e23dc7 988ddb77218d3975dd13dee7bb0e1fae098a9fdb git Not specified
CNA Linux Linux affected 5fd7a84a09e640016fe106dd3e992f5210e23dc7 3e977386521b71471e66ec2ba82efdfcc456adf2 git Not specified
CNA Linux Linux affected 5fd7a84a09e640016fe106dd3e992f5210e23dc7 245165658e1c9f95c0fecfe02b9b1ebd30a1198a git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.4.7 6.4.* semver Not specified
CNA Linux Linux unaffected 6.5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3e977386521b71471e66ec2ba82efdfcc456adf2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/988ddb77218d3975dd13dee7bb0e1fae098a9fdb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/245165658e1c9f95c0fecfe02b9b1ebd30a1198a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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