{"apiVersion":"1.0","identifier":"CVE-2026-72237","description":"In the Linux kernel, the following vulnerability has been resolved: perf/x86/amd/brs: Fix kernel address leakage A user-only branch stack can contain branches that originate from the kernel. As a result, kernel addresses are exposed to user space even when PERF_SAMPLE_BRANCH_USER is requested. On AMD processors supporting X86_FEATURE_BRS (Zen 3 only), perf can still report entries such as SYSRET/interrupt returns for which the branch-from addresses are in the kernel. E.g. $ perf record -j any,u -c 4000 -e branch-brs -o - -- \\ perf bench syscall basic --loop 1000 | \\ perf script -i - -F brstack|tr - - -\\n-| \\ grep -E -0x[89a-f][0-9a-f]{15}- ... 0xffffffff810001c4/0x72e2e32955eb/-/-/-/0//- 0xffffffff810001c4/0x72e2d94a9821/-/-/-/0//- 0xffffffff810001c4/0x72e2d94ffa1b/-/-/-/0//- ... BRS provides no hardware branch filtering, so privilege level filtering is performed entirely in software. However, amd_brs_match_plm() only validates the branch-to address against the requested privilege levels. For branches from the kernel to user space, the branch-from address is left unchecked and is leaked. Extend the software filter to also validate the branch-from address, so that any branch record whose branch-from address is in the kernel is dropped when PERF_SAMPLE_BRANCH_USER is requested.","publishedAt":"2026-08-15T06:21:50","lastModifiedAt":"2026-08-19T17:21:00","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72237","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00206,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72237","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72237","en":"https://www.redsauce.net/en/cves/CVE-2026-72237","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72237","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72237","de":"https://www.redsauce.net/de/cves/CVE-2026-72237","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72237","el":"https://www.redsauce.net/el/cves/CVE-2026-72237"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72237"}}