perf: arm_pmuv3: Zero initialize hw_id branch stack field

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Summary

CVECVE-2026-90272
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:23 UTC
Updated2026-09-17 17:17:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: perf: arm_pmuv3: Zero initialize hw_id branch stack field PERF_SAMPLE_BRANCH_HW_INDEX is supported by BRBE so hw_id is passed to userspace, but it's never set by the BRBE driver. Zero initialize it as it should be according to the docs: * For the architectures whose raw branch records are * already stored in age order, the hw_idx should be 0. It's probably too risky to remove PERF_SAMPLE_BRANCH_HW_INDEX from BRBE now in case anyone is setting it and reading the value, but zero initializing the whole struct also protects against the same issue with new fields that are added in the future.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f 57b72442c1672963fd51ab441ca1b71f6dc79b66 git Not specified
CNA Linux Linux affected 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f 988e11b69ef9d4034e19c64407030fa948580c3d git Not specified
CNA Linux Linux affected 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f 7c3b63386c27bed8d59a4b4c283d02860420eb0a git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 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/57b72442c1672963fd51ab441ca1b71f6dc79b66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c3b63386c27bed8d59a4b4c283d02860420eb0a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/988e11b69ef9d4034e19c64407030fa948580c3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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