CVE-2026-43079

A flaw was found in the Linux kernel's perf/x86/intel/uncore component. This vulnerability occurs when Non-Uniform Memory Access (NUMA) is disabled and the system boots with fewer CPUs than available in a processor die. Under these conditions, the kernel continues to parse a discovery table for offline dies, leading to an array overflow. This issue may result in system instability or other undefined behavior.

Red Hat acknowledges the upstream Linux kernel correction for «perf/x86/intel/uncore» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

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.