CVE-2026-72237perf/x86/amd/brs: Fix kernel address leakage
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 builds before 4f949bc3913a6e3ce3b8574ac6ed1da8ec7a5ad1; from 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 before ac44b4a3d6137489f8fa2e794b12e849c6b22eaa; 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 builds before 90843d00dbc61220b66408ea0d8775cae9e51f70; 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 builds before 046f6244da9b68e463a849b21446b9424e531491; 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 builds before 2e706be56f418718bb3ae66c0aa94f9b61150e6d; 8910075d61a37e5b0d82e6c83ed9a0a31fe9ea08 builds before 47915e855fb38b42133e31ba917d99565f862154 | CNA record |
References
- https://git.kernel.org/stable/c/4f949bc3913a6e3ce3b8574ac6ed1da8ec7a5ad1
- https://git.kernel.org/stable/c/ac44b4a3d6137489f8fa2e794b12e849c6b22eaa
- https://git.kernel.org/stable/c/90843d00dbc61220b66408ea0d8775cae9e51f70
- https://git.kernel.org/stable/c/046f6244da9b68e463a849b21446b9424e531491
- https://git.kernel.org/stable/c/2e706be56f418718bb3ae66c0aa94f9b61150e6d
- https://git.kernel.org/stable/c/47915e855fb38b42133e31ba917d99565f862154
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.