Riskcovery

CVE-2026-90272

perf: arm_pmuv3: Zero initialize hw_id branch stack field

State
Published
Severity
Not scored
Published
Sep 17, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f to before 57b72442c1672963fd51ab441ca1b71f6dc79b66Affected
  • 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f to before 988e11b69ef9d4034e19c64407030fa948580c3dAffected
  • 58074a0fce66c6c97b35ce8a28ed4e7b780f9a8f to before 7c3b63386c27bed8d59a4b4c283d02860420eb0aAffected
LinuxLinux
  • 6.17Affected
  • before 6.17Not affected
  • 6.18.52 through 6.18.*Not affected
  • 7.2.6 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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