blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none (CVE-2023-53292) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2023-53292

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

Answer in brief

CVE-2023-53292 records a Unknown severity vulnerability in blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2025Updated Sep 8, 2026Source checked Sep 8, 2026First seen by HOL Sep 8, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 5 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=5fd7a84a09e640016fe106dd3e992f5210e23dc7 <988ddb77218d3975dd13dee7bb0e1fae098a9fdb \|\| >=5fd7a84a09e640016fe106dd3e992f5210e23dc7 <3e977386521b71471e66ec2ba82efdfcc456adf2 \|\| >=5fd7a84a09e640016fe106dd3e992f5210e23dc7 <245165658e1c9f95c0fecfe02b9b1ebd30a1198a	988ddb77218d3975dd13dee7bb0e1fae098a9fdb, 3e977386521b71471e66ec2ba82efdfcc456adf2, 245165658e1c9f95c0fecfe02b9b1ebd30a1198a
Linux/Linuxgeneric	5.19	Not reported
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric	>=V3.1.6 <*	*
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric	>=V3.1.6 <*	*
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric	>=V3.1.6 <*	*

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP.
Review the reported fix. Update Linux/Linux to 988ddb77218d3975dd13dee7bb0e1fae098a9fdb; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 8, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.