A defect in the Linux kernel’s perf/amd/ibs subsystem caused an unsafe call to perf_allow_kernel() while executing in Non‑Maskable Interrupt (NMI) context. The call in this hard‑interrupt environment can trigger a kernel fault, leading to a crash. The fix removes the unsafe call and stores the required permission flag during event initialization, allowing the NMI handler to reference a cached value instead.

Systems running a Linux kernel that includes the perf/amd/ibs code path are affected. The vendor/product information lists Linux:Linux, and the CNA provides no specific version ranges. Therefore any kernel containing the original perf/amd/ibs implementation could be vulnerable.

The CVSS score is 5.5 and the EPSS score is < 1%, and the vulnerability is not listed in the CISA KEV catalog, indicating no publicly known exploitation at this time. The likely attack vector is an NMI trigger during active IBS activity, which an attacker could attempt to invoke in order to cause the kernel fault. Based on the description, it is inferred that the attack would result in a system‑wide kernel crash, but exact exploitation conditions and feasibility remain uncertain.