cpufreq: zero-initialize policy cpumask before sysfs publication

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Summary

CVECVE-2026-97905
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:17 UTC
Updated2026-09-25 11:17:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cpufreq: zero-initialize policy cpumask before sysfs publication cpufreq_policy_alloc() allocates policy->cpus with alloc_cpumask_var(), i.e. without __GFP_ZERO, unlike the sibling related_cpus and real_cpus masks. With CONFIG_CPUMASK_OFFSTACK=y the mask is a separate kmalloc_node() allocation, so its bitmap holds whatever the slab allocator left behind: cpufreq_online() cpufreq_policy_alloc() alloc_cpumask_var(&policy->cpus) /* bitmap is uninitialized */ kobject_init_and_add() /* policy%u/ appears in sysfs */ cpufreq_policy_online() cpumask_copy(policy->cpus, cpumask_of(cpu)) /* first valid value */ This leaves a window in which the sysfs attributes are already reachable while policy->cpus is still garbage. show()/store() gate on policy_is_inactive(), i.e. cpumask_empty(policy->cpus), so a non-zero bitmap makes them run the attribute callbacks on a policy that is not initialized yet. Fix this by using zalloc_cpumask_var() for policy->cpus.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.088150000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2fc3384dc75bf7333384c7a16d12c796f61c3f56 0de2f3918fbbbb767e7e716178194b66560dd12a git Not specified
CNA Linux Linux affected 2fc3384dc75bf7333384c7a16d12c796f61c3f56 6e166b9281dec98aed19213a84235250e5fdb081 git Not specified
CNA Linux Linux affected 2fc3384dc75bf7333384c7a16d12c796f61c3f56 bbc0472d2270bf732142ca71579d6ede636174ed git Not specified
CNA Linux Linux affected 2fc3384dc75bf7333384c7a16d12c796f61c3f56 54d37bcf2f497140b9207968557ddb484058e749 git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/54d37bcf2f497140b9207968557ddb484058e749 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0de2f3918fbbbb767e7e716178194b66560dd12a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bbc0472d2270bf732142ca71579d6ede636174ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e166b9281dec98aed19213a84235250e5fdb081 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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