CVE-2024-46754 bpf: Remove tst_run from lwt_seg6local_prog_ops.
A null pointer dereference in the Linux kernel BPF subsystem allows local attackers to cause a denial of service via the lwt_seg6local test run function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-46754?
CVE-2024-46754 is a high-severity vulnerability in Linux kernel, published on 18 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2024-46754?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-46754?
Apply the vendor's patch.
Is CVE-2024-46754 being exploited?
There is no known exploitation of CVE-2024-46754 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-62615, AZL-68297, BELL-CVE-2024-46754, DEBIAN-CVE-2024-46754, GHSA-crwm-whhx-38v8, ROOT-OS-DEBIAN-11-CVE-2024-46754 and 3 more.