CVE-2026-74260 netfilter: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them
A race condition in Linux kernel netfilter duplication logic could cause imbalanced recursion counters, potentially leading to denial of service.
- 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-2026-74260?
CVE-2026-74260 is a high-severity vulnerability in Linux, published on 15 Aug 2026. 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: nf_dup_netdev: add nf_dev_xmit_recursion*() helpers and use them
Update nft_dup and nft_fwd to use the nf_dev_xmit_recursion() helpers. This patch also disables BH when transmitting the skb to address a possible migration to different CPU leading to imbalanced decrementation of the recursion counters.
This is modeled after Florian Westphal's dev_xmit_recursion*() API available since commit 97cdcf37b57e ("net: place xmit recursion in softnet data") according to its current state in the tree.
Which versions are affected by CVE-2026-74260?
How do I fix CVE-2026-74260?
Apply the vendor's patch.
Is CVE-2026-74260 being exploited?
There is no known exploitation of CVE-2026-74260 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74260, DEBIAN-CVE-2026-74260, GHSA-3847-fgf2-64xp, UBUNTU-CVE-2026-74260.