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Description

In 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().

PUBLISHED Reserved 2026-05-01 | Published 2026-05-06 | Updated 2026-05-06 | Assigner Linux

Product status

Default status
unaffected

7a8c994cbb2db3c5335cee35fd486557f5aaf7e1 (git) before 68f38f648e4b5bed2aeadd2f711e25302e6490f8
affected

7a8c994cbb2db3c5335cee35fd486557f5aaf7e1 (git) before 6cfed39c2ce64ac024bbde458a9727105e0b8c66
affected

7a8c994cbb2db3c5335cee35fd486557f5aaf7e1 (git) before 0089ce1c056aee547115bdc25c223f8f88c08498
affected

Default status
affected

6.18
affected

Any version before 6.18
unaffected

6.18.14 (semver)
unaffected

6.19.4 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/68f38f648e4b5bed2aeadd2f711e25302e6490f8

git.kernel.org/...c/6cfed39c2ce64ac024bbde458a9727105e0b8c66

git.kernel.org/...c/0089ce1c056aee547115bdc25c223f8f88c08498

cve.org (CVE-2026-43122)

nvd.nist.gov (CVE-2026-43122)

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