{"cve":"CVE-2022-49565","nvd":{"published":"2025-02-26T07:01:32.240","modified":"2026-06-17T05:18:27.970","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel/lbr: Fix unchecked MSR access error on HSW\n\nThe fuzzer triggers the below trace.\n\n[ 7763.384369] unchecked MSR access error: WRMSR to 0x689\n(tried to write 0x1fffffff8101349e) at rIP: 0xffffffff810704a4\n(native_write_msr+0x4/0x20)\n[ 7763.397420] Call Trace:\n[ 7763.399881]  <TASK>\n[ 7763.401994]  intel_pmu_lbr_restore+0x9a/0x1f0\n[ 7763.406363]  intel_pmu_lbr_sched_task+0x91/0x1c0\n[ 7763.410992]  __perf_event_task_sched_in+0x1cd/0x240\n\nOn a machine with the LBR format LBR_FORMAT_EIP_FLAGS2, when the TSX is\ndisabled, a TSX quirk is required to access LBR from registers.\nThe lbr_from_signext_quirk_needed() is introduced to determine whether\nthe TSX quirk should be applied. However, the\nlbr_from_signext_quirk_needed() is invoked before the\nintel_pmu_lbr_init(), which parses the LBR format information. Without\nthe correct LBR format information, the TSX quirk never be applied.\n\nMove the lbr_from_signext_quirk_needed() into the intel_pmu_lbr_init().\nChecking x86_pmu.lbr_has_tsx in the lbr_from_signext_quirk_needed() is\nnot required anymore.\n\nBoth LBR_FORMAT_EIP_FLAGS2 and LBR_FORMAT_INFO have LBR_TSX flag, but\nonly the LBR_FORMAT_EIP_FLAGS2 requirs the quirk. Update the comments\naccordingly.","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/625bcd0685a1612225df83468c83412fc0edb3d7","https://git.kernel.org/stable/c/b0380e13502adf7dd8be4c47d622c3522aae6c63"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2022-49565","score":0.00222,"percentile":0.12844,"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."]}