The Linux kernel contained a vulnerability in the bpf_fd_array_map_clear() function where a missing cond_resched() call in a loop caused RCU stalls. Specifically, for PROG_ARRAY maps with many entries, the loop calls prog_array_map_poke_run() for each entry, which is computationally expensive. Without yielding the CPU, this can cause Read-Copy-Update (RCU) grace period stalls under load, potentially impacting system availability. The issue was fixed by adding the missing cond_resched() call to allow the kernel to reschedule and avoid stalls.

This vulnerability can cause kernel RCU stalls, leading to denial of service conditions where kernel worker threads become unresponsive under heavy load. There is no impact on confidentiality or integrity, but availability is affected due to the potential for kernel stalls.

A fix has been implemented in the Linux kernel by adding the missing cond_resched() call in bpf_fd_array_map_clear(). Users should apply the official kernel updates that include this fix. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor or Linux kernel advisory for the current remediation guidance.