CVE-2025-21965 Information

Description

In the Linux kernel the following vulnerability has been resolved:

sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()

If a BPF scheduler provides an invalid CPU (outside the nr_cpu_ids range) as prev_cpu to scx_bpf_select_cpu_dfl() it can cause a kernel crash.

To prevent this validate prev_cpu in scx_bpf_select_cpu_dfl() and trigger an scx error if an invalid CPU is specified.

Reference

https://git.kernel.org/stable/c/515680e76c536dd4aa8e2b5d674b0d441baddf5b https://git.kernel.org/stable/c/752b56bb76e2471197d25d6948d85753043b10da https://git.kernel.org/stable/c/9360dfe4cbd62ff1eb8217b815964931523b75b3