CVE-2026-90272
Description
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.
How to fix
- Linux Linux57b72442c1672963fd51ab441ca1b71f6dc79b66, 988e11b69ef9d4034e19c64407030fa948580c3d, 7c3b63386c27bed8d59a4b4c283d02860420eb0a or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f ≤ v < 57b72442c1672963fd51ab441ca1b71f6dc79b66, 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f ≤ v < 988e11b69ef9d4034e19c64407030fa948580c3d, 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f ≤ v < 7c3b63386c27bed8d59a4b4c283d02860420eb0a, 6.17 | 57b72442c1672963fd51ab441ca1b71f6dc79b66, 988e11b69ef9d4034e19c64407030fa948580c3d, 7c3b63386c27bed8d59a4b4c283d02860420eb0a |
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