CVE-2026-74625
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.50% probability · 41th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.