CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's efivarfs mount point, where unprivileged users can exploit the statfs() handler to generate excessive calls to the costly QueryVariableInfo() runtime service. This can lead to performance degradation, particularly on x86 systems with SMM-backed variable stores, as it requires synchronization across all CPUs. System administrators and organizations using affected Linux distributions should prioritize applying the patch to mitigate potential denial-of-service conditions.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: efivarfs: Rate limit statfs() handler Ravi reports that statfs() may be called by unprivileged users on the efivarfs mount point, which may result in a flood of calls to the QueryVariableInfo() runtime service. These calls are disproportionately costly on x86 systems where the variable store is backed by SMM, as each SMM entry requires a rendez-vous of all the CPUs. So rate limit the calls to QueryVariableInfo() at twice per second, and return the most recently obtained value for calls that are elided.