CVE-2026-74625 netfilter: bridge: release template ct on non-IP path
A memory leak in the Linux kernel bridge netfilter allows attackers to exhaust slab memory via non-IP packets, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74625?
CVE-2026-74625 is a high-severity memory corruption vulnerability in Linux, published on 22 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: bridge: release template ct on non-IP path
A bridge nftables ct zone set rule can attach a conntrack template to an skb before nf_ct_bridge_pre() sees it. For non-IPv4 and non-IPv6 EtherTypes, nf_ct_bridge_pre() currently overwrites skb->_nfct with IP_CT_UNTRACKED without releasing the existing template reference.
That makes the per-cpu template, and any temporary templates allocated for concurrent use, unreachable and leaks memory until the host runs out of slab.
Reset the skb conntrack state before marking the frame untracked so the existing template reference is dropped on the non-IP path.
Which versions are affected by CVE-2026-74625?
How do I fix CVE-2026-74625?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74625 being exploited?
There is no known exploitation of CVE-2026-74625 in the wild and no public exploit code.
Sources
Also known as AZL-97284, BELL-CVE-2026-74625, DEBIAN-CVE-2026-74625, GHSA-vjwv-39q4-jxgj, UBUNTU-CVE-2026-74625.