perf/x86/intel: Improve validation and configuration of ACR masks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53370
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 09:17:02 UTC
Updated2026-07-19 09:17:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: perf/x86/intel: Improve validation and configuration of ACR masks Currently there are several issues on the user space ACR mask validation and configuration. - The validation for user space ACR mask (attr.config2) is incomplete, e.g., the ACR mask could include the index which belongs to another ACR events group, but it's not validated. - An early return on an invalid ACR mask caused all subsequent ACR groups to be skipped. - The stale hardware ACR mask (hw.config1) is not cleared before setting new hardware ACR mask. The following changes address all of the above issues. - Figure out the event index group of an ACR group. Any bits in the user-space mask not present in the index group are now dropped. - Instead of an early return on invalid bits, drop only the invalid portions and continue iterating through all ACR events to ensure full configuration. - Explicitly clear the stale hardware ACR mask for each event prior to writing the new configuration. Besides, a non-leader event member of ACR group could be disabled in theory. This could cause bit-shifting errors in the acr_mask of remaining group members. But since ACR sampling requires all events to be active, this should not be a big concern in real use case. Add a "FIXME" comment to notice this risk.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.062370000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ec980e4facef8110f6fce27e5b6344660117f01f aab56b95bee3ff79176b13443cd9d7cfe9747df0 git Not specified
CNA Linux Linux affected ec980e4facef8110f6fce27e5b6344660117f01f c05e01cef47d9b4969eae2dcf9467e2a555bcb4f git Not specified
CNA Linux Linux affected ec980e4facef8110f6fce27e5b6344660117f01f 5ad732a56be46aabf158c16aa0c095291727aaef git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aab56b95bee3ff79176b13443cd9d7cfe9747df0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c05e01cef47d9b4969eae2dcf9467e2a555bcb4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ad732a56be46aabf158c16aa0c095291727aaef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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