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CVE-2026-74625: netfilter: bridge: release template ct on non-IP path

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-22 · updated 2026-10-16

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.

Affected products

• Linux kernel: 5.3 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/46d559f00b1ab1d114f92d2f16c5ef0093b3b9dd
• https://git.kernel.org/stable/c/6ea88401e10e04e0b3bb7a7adea54932fb60b93b
• https://git.kernel.org/stable/c/7cff440d702616022769f2643168d7f9820547a0
• https://git.kernel.org/stable/c/bd7b16494dacf87e9336a1dcfdada83b9e40edd6
• https://git.kernel.org/stable/c/c58d34fe8b7e47bb0b350a7625023b1261342be5
• https://git.kernel.org/stable/c/d45cc8020d7c0a9f01dee42ff5c40bc14c9af72f
• https://git.kernel.org/stable/c/daa6e070f8e1e7a4dddec8b64ca37663f8cda917
• https://git.kernel.org/stable/c/fc90df37540627d092af770215fb4b7befe9409b

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