firmware: arm_scmi: Fix requested device removal race (CVE-2026-92506) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-92506

firmware: arm_scmi: Fix requested device removal race

Answer in brief

CVE-2026-92506 records a Unknown severity vulnerability in firmware: arm_scmi: Fix requested device removal race. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=d3cd7c525fd2ecce3a6c963f314969a54783d211 <2ff7713b7308cd6bea3328f7cd750b5eaab42af3 \|\| >=d3cd7c525fd2ecce3a6c963f314969a54783d211 <1c35915eaaa81a12340c838c5c2ccb02be2194c3 \|\| >=d3cd7c525fd2ecce3a6c963f314969a54783d211 <c3d4ef1c0ca6917aad6f1093b49f3932944a8c19 \|\| >=d3cd7c525fd2ecce3a6c963f314969a54783d211 <21d35c5f46e99e9047bb9ded3ecb5ab440dd75b3 \|\| >=d3cd7c525fd2ecce3a6c963f314969a54783d211 <2c4097e6c4aed276c5e9ec2ab331ab397ea780bf	2ff7713b7308cd6bea3328f7cd750b5eaab42af3, 1c35915eaaa81a12340c838c5c2ccb02be2194c3, c3d4ef1c0ca6917aad6f1093b49f3932944a8c19, 21d35c5f46e99e9047bb9ded3ecb5ab440dd75b3, 2c4097e6c4aed276c5e9ec2ab331ab397ea780bf
Linux/Linuxgeneric	6.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 2ff7713b7308cd6bea3328f7cd750b5eaab42af3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Fix requested device removal race scmi_protocol_device_unrequest() drops scmi_requested_devices_mtx while notifying listeners but continues to retain the per-protocol list head. When two SCMI drivers for the same protocol unregister concurrently, one thread can remove the final request and free the list head while the other is running its notifier. The latter then dereferences the freed list head after reacquiring the mutex and can free it a second time. Complete the list and IDR updates, including freeing an empty list head, before dropping the mutex. Keep the blocking notifier outside the critical section and retain only the detached request across the callback.

Quoted source text, attributed separately from HOL analysis.