ACPI: processor: Update cpuidle driver check in __acpi_processor_start()

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Summary

CVECVE-2026-43122
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:29 UTC
Updated2026-05-12 21:17:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ACPI: processor: Update cpuidle driver check in __acpi_processor_start() Commit 7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle driver registration") moved the ACPI idle driver registration to acpi_processor_driver_init() and acpi_processor_power_init() does not register an idle driver any more. Accordingly, the cpuidle driver check in __acpi_processor_start() needs to be updated to avoid calling acpi_processor_power_init() without a cpuidle driver, in which case the registration of the cpuidle device in that function would lead to a NULL pointer dereference in __cpuidle_register_device().

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

Problem Types: CWE-476

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 7a8c994cbb2db3c5335cee35fd486557f5aaf7e1 68f38f648e4b5bed2aeadd2f711e25302e6490f8 git Not specified
CNA Linux Linux affected 7a8c994cbb2db3c5335cee35fd486557f5aaf7e1 6cfed39c2ce64ac024bbde458a9727105e0b8c66 git Not specified
CNA Linux Linux affected 7a8c994cbb2db3c5335cee35fd486557f5aaf7e1 0089ce1c056aee547115bdc25c223f8f88c08498 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6cfed39c2ce64ac024bbde458a9727105e0b8c66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/68f38f648e4b5bed2aeadd2f711e25302e6490f8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0089ce1c056aee547115bdc25c223f8f88c08498 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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