Linux Kernel up to 7.1.8 Bridge nf_ct_bridge_pre _nfct memory leak

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.88

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.8. It has been declared as critical. This impacts the function nf_ct_bridge_pre of the component Bridge. Executing a manipulation of the argument _nfct can lead to memory leak. The identification of this vulnerability is CVE-2026-74625. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.8. It has been declared as critical. This vulnerability affects the function nf_ct_bridge_pre of the component Bridge. The manipulation of the argument _nfct with an unknown input leads to a memory leak vulnerability. The CWE definition for the vulnerability is CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-74625 since 08/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/22/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45 or 7.1.9 eliminates this vulnerability. Applying the patch fc90df37540627d092af770215fb4b7befe9409b/daa6e070f8e1e7a4dddec8b64ca37663f8cda917/bd7b16494dacf87e9336a1dcfdada83b9e40edd6/6ea88401e10e04e0b3bb7a7adea54932fb60b93b/46d559f00b1ab1d114f92d2f16c5ef0093b3b9dd/c58d34fe8b7e47bb0b350a7625023b1261342be5/7cff440d702616022769f2643168d7f9820547a0/d45cc8020d7c0a9f01dee42ff5c40bc14c9af72f is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.265/5.15.216/6.1.183/6.6.152/6.12.104/6.18.45/7.1.9
Patch: fc90df37540627d092af770215fb4b7befe9409b/daa6e070f8e1e7a4dddec8b64ca37663f8cda917/bd7b16494dacf87e9336a1dcfdada83b9e40edd6/6ea88401e10e04e0b3bb7a7adea54932fb60b93b/46d559f00b1ab1d114f92d2f16c5ef0093b3b9dd/c58d34fe8b7e47bb0b350a7625023b1261342be5/7cff440d702616022769f2643168d7f9820547a0/d45cc8020d7c0a9f01dee42ff5c40bc14c9af72f

Timelineinfo

08/15/2026 CVE reserved
08/22/2026 +7 days Advisory disclosed
08/22/2026 +0 days VulDB entry created
08/22/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74625 (🔒)
GCVE (CVE): GCVE-0-2026-74625
GCVE (VulDB): GCVE-100-394414

Entryinfo

Created: 08/22/2026 18:27
Changes: 08/22/2026 18:27 (60)
Complete: 🔍
Cache ID: 216::103

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