{"id":"CVE-2026-53370","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel: Improve validation and configuration of ACR masks\n\nCurrently there are several issues on the user space ACR mask validation\nand configuration.\n- The val…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel: Improve validation and configuration of ACR masks\n\nCurrently there are several issues on the user space ACR mask validation\nand configuration.\n- The val…","severity":"none","published":"2026-07-19","updated":"2026-07-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53370","references":[{"url":"https://git.kernel.org/stable/c/5ad732a56be46aabf158c16aa0c095291727aaef","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/aab56b95bee3ff79176b13443cd9d7cfe9747df0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c05e01cef47d9b4969eae2dcf9467e2a555bcb4f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00124,"epssPercentile":0.02457,"ingestedAt":"2026-07-19T14:31:07.410Z","slug":"CVE-2026-53370","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel: Improve validation and configuration of ACR masks\n\nCurrently there are several issues on the user space ACR mask validation\nand configuration.\n- The validation for user space ACR mask (attr.config2) is incomplete,\n  e.g., the ACR mask could include the index which belongs to another\n  ACR events group, but it's not validated.\n- An early return on an invalid ACR mask caused all subsequent ACR groups\n  to be skipped.\n- The stale hardware ACR mask (hw.config1) is not cleared before setting\n  new hardware ACR mask.\n\nThe following changes address all of the above issues.\n- Figure out the event index group of an ACR group. Any bits in the\n  user-space mask not present in the index group are now dropped.\n- Instead of an early return on invalid bits, drop only the invalid\n  portions and continue iterating through all ACR events to ensure full\n  configuration.\n- Explicitly clear the stale hardware ACR mask for each event prior to\n  writing the new configuration.\n\nBesides, a non-leader event member of ACR group could be disabled in\ntheory. This could cause bit-shifting errors in the acr_mask of remaining\ngroup members. But since ACR sampling requires all events to be active,\nthis should not be a big concern in real use case. Add a \"FIXME\" comment\nto notice this risk.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}