{"cve":"CVE-2026-53370","nvd":{"published":"2026-07-19T09:17:02.153","modified":"2026-07-29T16:55:32.737","status":"Analyzed","description":"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 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/5ad732a56be46aabf158c16aa0c095291727aaef","https://git.kernel.org/stable/c/aab56b95bee3ff79176b13443cd9d7cfe9747df0","https://git.kernel.org/stable/c/c05e01cef47d9b4969eae2dcf9467e2a555bcb4f"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-53370","score":0.0016,"percentile":0.05169,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}