CVE-2026-72325

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the Linux kernel where Branch Sampling (BRS) and Last Branch Record (LBR) are treated as mutually exclusive hardware features, both tracked via the cpuc->lbr users variable. On PerfMonV2-capable processors, when Secure Virtual Machine (SVM) is toggled, the kernel calls the amd pmu enable all() function to rewrite event selectors. This function subsequently calls amd brs enable all(), which attempts to enable BRS if cpuc->lbr users is greater than zero. On hardware that supports LBR but not BRS, the kernel attempts to set the BRS enable bit in the DebugExtnCfg (MSR 0xc000010f) register. Because this bit is deprecated on such hardware, the operation triggers a General Protection Fault (#GP).

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.