CVE-2026-74625

netfilter: bridge: release template ct on non-IP path

State: Published
Severity: 7.5 High
Published: Aug 22, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3c171f496ef57774f8e5d509923372549734877f to before fc90df37540627d092af770215fb4b7befe9409bAffected 3c171f496ef57774f8e5d509923372549734877f to before daa6e070f8e1e7a4dddec8b64ca37663f8cda917Affected 3c171f496ef57774f8e5d509923372549734877f to before bd7b16494dacf87e9336a1dcfdada83b9e40edd6Affected 3c171f496ef57774f8e5d509923372549734877f to before 6ea88401e10e04e0b3bb7a7adea54932fb60b93bAffected 3c171f496ef57774f8e5d509923372549734877f to before 46d559f00b1ab1d114f92d2f16c5ef0093b3b9ddAffected 3c171f496ef57774f8e5d509923372549734877f to before c58d34fe8b7e47bb0b350a7625023b1261342be5Affected 3c171f496ef57774f8e5d509923372549734877f to before 7cff440d702616022769f2643168d7f9820547a0Affected 3c171f496ef57774f8e5d509923372549734877f to before d45cc8020d7c0a9f01dee42ff5c40bc14c9af72fAffected
LinuxLinux	5.3Affected before 5.3Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.152 through 6.6.Not affected 6.12.104 through 6.12.Not affected 6.18.45 through 6.18.Not affected 7.1.9 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

3c171f496ef57774f8e5d509923372549734877f to before fc90df37540627d092af770215fb4b7befe9409bAffected
3c171f496ef57774f8e5d509923372549734877f to before daa6e070f8e1e7a4dddec8b64ca37663f8cda917Affected
3c171f496ef57774f8e5d509923372549734877f to before bd7b16494dacf87e9336a1dcfdada83b9e40edd6Affected
3c171f496ef57774f8e5d509923372549734877f to before 6ea88401e10e04e0b3bb7a7adea54932fb60b93bAffected
3c171f496ef57774f8e5d509923372549734877f to before 46d559f00b1ab1d114f92d2f16c5ef0093b3b9ddAffected
3c171f496ef57774f8e5d509923372549734877f to before c58d34fe8b7e47bb0b350a7625023b1261342be5Affected
3c171f496ef57774f8e5d509923372549734877f to before 7cff440d702616022769f2643168d7f9820547a0Affected
3c171f496ef57774f8e5d509923372549734877f to before d45cc8020d7c0a9f01dee42ff5c40bc14c9af72fAffected

LinuxLinux

5.3Affected
before 5.3Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.152 through 6.6.*Not affected
6.12.104 through 6.12.*Not affected
6.18.45 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

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