CVE-2026-90272perf: arm_pmuv3: Zero initialize hw_id branch stack field
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: perf: arm_pmuv3: Zero initialize hw_id branch stack field PERF_SAMPLE_BRANCH_HW_INDEX is supported by BRBE so hw_id is passed to userspace, but it's never set by the BRBE driver. Zero initialize it as it should be according to the docs: * For the architectures whose raw branch records are * already stored in age order, the hw_idx should be 0. It's probably too risky to remove PERF_SAMPLE_BRANCH_HW_INDEX from BRBE now in case anyone is setting it and reading the value, but zero initializing the whole struct also protects against the same issue with new fields that are added in the future.
- 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
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f builds before 57b72442c1672963fd51ab441ca1b71f6dc79b66; 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f builds before 988e11b69ef9d4034e19c64407030fa948580c3d; 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f builds before 7c3b63386c27bed8d59a4b4c283d02860420eb0a | CNA record |
References
- https://git.kernel.org/stable/c/57b72442c1672963fd51ab441ca1b71f6dc79b66
- https://git.kernel.org/stable/c/988e11b69ef9d4034e19c64407030fa948580c3d
- https://git.kernel.org/stable/c/7c3b63386c27bed8d59a4b4c283d02860420eb0a
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.