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CVE-2026-74625

Unknown

Last modified

CVE-2026-74625 is a vulnerability of currently unknown severity. 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..

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 Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 3c171f496ef57774f8e5d509923372549734877f, < fc90df37540627d092af770215fb4b7befe9409b; >= 3c171f496ef57774f8e5d509923372549734877f, < daa6e070f8e1e7a4dddec8b64ca37663f8cda917; >= 3c171f496ef57774f8e5d509923372549734877f, < bd7b16494dacf87e9336a1dcfdada83b9e40edd6; >= 3c171f496ef57774f8e5d509923372549734877f, < 6ea88401e10e04e0b3bb7a7adea54932fb60b93b; >= 3c171f496ef57774f8e5d509923372549734877f, < 46d559f00b1ab1d114f92d2f16c5ef0093b3b9dd; >= 3c171f496ef57774f8e5d509923372549734877f, < c58d34fe8b7e47bb0b350a7625023b1261342be5; >= 3c171f496ef57774f8e5d509923372549734877f, < 7cff440d702616022769f2643168d7f9820547a0; >= 3c171f496ef57774f8e5d509923372549734877f, < d45cc8020d7c0a9f01dee42ff5c40bc14c9af72f
LinuxLinux5.3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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. 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.
How severe is CVE-2026-74625?
Severity scoring for CVE-2026-74625 is pending analysis.
How do I fix CVE-2026-74625?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST