firmware: arm_scmi: Fix requested device removal race

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92506
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:53 UTC
Updated2026-09-17 17:17:53 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101660000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d3cd7c525fd2ecce3a6c963f314969a54783d211 2ff7713b7308cd6bea3328f7cd750b5eaab42af3 git Not specified
CNA Linux Linux affected d3cd7c525fd2ecce3a6c963f314969a54783d211 1c35915eaaa81a12340c838c5c2ccb02be2194c3 git Not specified
CNA Linux Linux affected d3cd7c525fd2ecce3a6c963f314969a54783d211 c3d4ef1c0ca6917aad6f1093b49f3932944a8c19 git Not specified
CNA Linux Linux affected d3cd7c525fd2ecce3a6c963f314969a54783d211 21d35c5f46e99e9047bb9ded3ecb5ab440dd75b3 git Not specified
CNA Linux Linux affected d3cd7c525fd2ecce3a6c963f314969a54783d211 2c4097e6c4aed276c5e9ec2ab331ab397ea780bf git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1c35915eaaa81a12340c838c5c2ccb02be2194c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21d35c5f46e99e9047bb9ded3ecb5ab440dd75b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2ff7713b7308cd6bea3328f7cd750b5eaab42af3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3d4ef1c0ca6917aad6f1093b49f3932944a8c19 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c4097e6c4aed276c5e9ec2ab331ab397ea780bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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