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CVE-2026-43344

kernel: perf/x86/intel/uncore: Fix die ID init and look up bugs

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 8, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's performance monitoring unit (perf/x86/intel/uncore) subsystem. This vulnerability arises from incorrect die ID initialization and lookup, particularly when certain CPUs are offline or when Non-Uniform Memory Access (NUMA) is disabled. As a consequence, performance monitoring units (PMON) may be ignored, potentially leading to a lack of critical performance data and affecting system observability.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-253 · Incorrect Check of Function Return Value