cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks

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Summary

CVECVE-2026-92492
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:51 UTC
Updated2026-09-17 17:17:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks cpufreq_cpu_get() returns NULL when no cpufreq policy is associated with the requested CPU, for example because the CPU is offline or the policy has already been torn down. Both amd_pstate_power_supply_notifier() and amd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then pass that pointer to amd_pstate_get_balanced_epp() and amd_pstate_set_epp(), which dereference it unconditionally. A racing CPU hotplug or driver teardown can therefore lead to a NULL pointer dereference on either of these dynamic EPP paths. The third cpufreq_cpu_get() caller in this file, amd_pstate_verify(), already handles the NULL case. Bring the two new callers in line with that pattern: return NOTIFY_OK from the power-supply notifier (matching the other "nothing to do" exits) and -ENODEV from amd_pstate_profile_set() (the usual cpufreq error for a missing CPU policy). Found by code inspection; not tested on hardware.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 471d6659925aa0dcb4ab2520fa5ee3f49dfeab22 70c8c8b50d80f681f50ddcc66a9400dd87508913 git Not specified
CNA Linux Linux affected e30ca6dd5345c5b8ba05f346a8e81105352fe571 f4ade8d224756ab69f108204dde6777bac4664e4 git Not specified
CNA Linux Linux affected e30ca6dd5345c5b8ba05f346a8e81105352fe571 39c0cf62fc7851a17782e7efe8dfb2948739c681 git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 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/70c8c8b50d80f681f50ddcc66a9400dd87508913 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/39c0cf62fc7851a17782e7efe8dfb2948739c681 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f4ade8d224756ab69f108204dde6777bac4664e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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