CVE-2024-46754 Information

Description

In the Linux kernel the following vulnerability has been resolved:

bpf: Remove tst_run from lwt_seg6local_prog_ops.

The syzbot reported that the lwt_seg6 related BPF ops can be invoked via bpf_test_run() without without entering input_action_end_bpf() first.

Martin KaFai Lau said that self test for BPF_PROG_TYPE_LWT_SEG6LOCAL probably didn’t work since it was introduced in commit 04d4b274e2a (\ipv6: sr: Add seg6local action End.BPF). The reason is that the per-CPU variable seg6_bpf_srh_states::srh is never assigned in the self test case but each BPF function expects it.

Remove test_run for BPF_PROG_TYPE_LWT_SEG6LOCAL.

Reference

https://git.kernel.org/stable/c/9cd15511de7c619bbd0f54bb3f28e6e720ded5d6 https://git.kernel.org/stable/c/c13fda93aca118b8e5cd202e339046728ee7dddb