CVE-2026-90272 perf: arm_pmuv3: Zero initialize hw_id branch stack field

In the Linux kernel, the following vulnerability has been resolved: perf: armpmuv3: Zero initialize hwid branch stack field PERFSAMPLEBRANCHHWINDEX is supported by BRBE so hwid is passed to userspace, but it's never set by the BRBE driver. Zero initialize it as it should be according to the docs:...

EUVD-2026-81865

In the Linux kernel, the following vulnerability has been resolved: perf: armpmuv3: Zero initialize hwid branch stack field PERFSAMPLEBRANCHHWINDEX is supported by BRBE so hwid is passed to userspace, but it's never set by the BRBE driver. Zero initialize it as it should be according to the docs:...

CVE-2026-90272

This vulnerability affects the Linux kernel 's ARM PMU v3 performance monitoring subsystem (perf: arm_pmuv3). The BRBE (Branch Record Buffer Extension) driver passes the hw_id field to userspace via PERF_SAMPLE_BRANCH_HW_INDEX, but never sets it, leaving it as uninitialized data . According to ke...