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Linux Kernel CVE-2026-80664

| EUVDEUVD-2026-67540 HIGH
2026-08-28 Linux GHSA-4wgj-9qhp-2583
Denial Of Service Linux Red Hat Suse
7.3
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
7.3 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
vuln.today AI
5.5 MEDIUM

NULL dereference causes kernel panic (A:H); no confidentiality or integrity impact is supported by described behavior; PR:L reflects CAP_NET_ADMIN requirement.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 07:50 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
7.3 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:49 cve.org
HIGH 7.3
CVE Published
Aug 28, 2026 - 06:49 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

netfilter: xt_nat: reject unsupported target families

xt_nat SNAT and DNAT target handlers assume IP-family conntrack state is present and can dereference a NULL pointer when instantiated from an unsupported family through nft_compat. A bridge-family compat rule can therefore trigger a NULL-dereference in nf_nat_setup_info().

Reject non-IP families in xt_nat_checkentry() so unsupported targets cannot be installed. Keep NFPROTO_INET allowed for valid inet NAT compat users and leave the runtime fast path unchanged.

[ The crash was fixed via 9dbba7e694ec ("netfilter: nft_compat: ebtables emulation must reject non-bridge targets"), so this patch is no longer critical. Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra family check is a good idea in any case. ]

AnalysisAI

NULL pointer dereference in the Linux kernel netfilter subsystem's xt_nat module allows a local attacker with low privileges to crash the kernel by instantiating SNAT or DNAT targets through the nft_compat compatibility layer using an unsupported bridge family, triggering a NULL dereference in nf_nat_setup_info(). Multiple stable kernel branches from 5.10 through 7.x are affected across numerous long-term support trees. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires local system access with CAP_NET_ADMIN capability or equivalent access through an unprivileged user namespace (permitted by default on several Linux distributions including Ubuntu). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 7.3 score (AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H) requires local access with low-privilege capability to create netfilter rules - typically CAP_NET_ADMIN - which meaningfully limits the attack surface to privileged local users or container escapes. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary remediation is to upgrade the Linux kernel to a patched stable release: 5.10.261 or later for the 5.10 LTS series, 5.15.212 or later for 5.15 LTS, 6.1.178 or later for 6.1 LTS, 6.6.145 or later for 6.6 LTS, 6.12.97 or later for 6.12, 6.18.40 or later for 6.18, 7.1.5 or later for 7.1, or 7.2 for the mainline series. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory your Linux systems to identify those running kernel versions 5.10 through 7.x across all LTS branches and determine local user access patterns. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-80664 vulnerability details – vuln.today
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