{"cve":"CVE-2026-90272","nvd":{"published":"2026-09-17T17:17:23.773","modified":"2026-10-19T09:19:20.773","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: arm_pmuv3: Zero initialize hw_id branch stack field\n\nPERF_SAMPLE_BRANCH_HW_INDEX is supported by BRBE so hw_id is passed to\nuserspace, but it's never set by the BRBE driver. Zero initialize it as\nit should be according to the docs:\n\n   * For the architectures whose raw branch records are\n   * already stored in age order, the hw_idx should be 0.\n\nIt's probably too risky to remove PERF_SAMPLE_BRANCH_HW_INDEX from BRBE\nnow in case anyone is setting it and reading the value, but zero\ninitializing the whole struct also protects against the same issue with\nnew fields that are added in the future.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/57b72442c1672963fd51ab441ca1b71f6dc79b66","https://git.kernel.org/stable/c/7c3b63386c27bed8d59a4b4c283d02860420eb0a","https://git.kernel.org/stable/c/988e11b69ef9d4034e19c64407030fa948580c3d"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:55:23.253742848+00:00"},"epss":{"cve":"CVE-2026-90272","score":0.00206,"percentile":0.10634,"date":"2026-10-25"},"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."]}