netfilter: bridge: release template ct on non-IP path
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.
CVE-2026-74625
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74625
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "fc90df37540627d092af770215fb4b7befe9409b",
"versionType": "git"
},
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "daa6e070f8e1e7a4dddec8b64ca37663f8cda917",
"versionType": "git"
},
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "bd7b16494dacf87e9336a1dcfdada83b9e40edd6",
"versionType": "git"
},
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "6ea88401e10e04e0b3bb7a7adea54932fb60b93b",
"versionType": "git"
},
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "46d559f00b1ab1d114f92d2f16c5ef0093b3b9dd",
"versionType": "git"
},
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "c58d34fe8b7e47bb0b350a7625023b1261342be5",
"versionType": "git"
},
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "7cff440d702616022769f2643168d7f9820547a0",
"versionType": "git"
},
{
"status": "affected",
"version": "3c171f496ef57774f8e5d509923372549734877f",
"lessThan": "d45cc8020d7c0a9f01dee42ff5c40bc14c9af72f",
"versionType": "git"
}
],
"programFiles": [
"net/bridge/netfilter/nf_conntrack_bridge.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bridge/netfilter/nf_conntrack_bridge.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74625
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34248 · Revision 1
- Added to Heist Feed
- Publisher date