CVE-2026-53370
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, the perf/x86/intel subsystem had incomplete validation and configuration of ACR (Adaptive Cache Replacement) masks. Issues included missing checks for indices belonging to other event groups, premature iteration exit on invalid masks, and failure to clear stale hardware masks before setting new ones.
Risk Assessment
Improper ACR mask validation can lead to incorrect hardware performance counter configuration, potentially causing unpredictable ACR behavior, which might enable privilege escalation or information disclosure.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit in the mainline branch). Monitor official security advisories from your Linux distribution for the patch.
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Original NVD description (English source)
In 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.