CVE-2022-50001 netfilter: nft_tproxy: restrict to prerouting hook
A missing check in the Linux kernel netfilter TPROXY module allows a null pointer dereference crash when used outside the prerouting hook.
- 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-2022-50001?
CVE-2022-50001 is a medium-severity vulnerability in Linux kernel, published on 18 Jun 2025. 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:
netfilter: nft_tproxy: restrict to prerouting hook
TPROXY is only allowed from prerouting, but nft_tproxy doesn't check this. This fixes a crash (null dereference) when using tproxy from e.g. output.
Which versions are affected by CVE-2022-50001?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50001?
Apply the vendor's patch.
Is CVE-2022-50001 being exploited?
There is no known exploitation of CVE-2022-50001 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-50001, GHSA-p2g8-3w2w-p6gf, UBUNTU-CVE-2022-50001.