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Linux Kernel CVE-2026-80738

| EUVDEUVD-2026-70342 HIGH
2026-09-03 Linux GHSA-83j6-pc2m-jhg5
Linux 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:H/I:H/A:L
vuln.today AI
7.3 HIGH

Local access with low-privilege BPF capabilities (CAP_BPF/CAP_NET_ADMIN) required; type-confused dereference yields high confidentiality and integrity impact with minor availability risk.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/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

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

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

Lifecycle Timeline

6
Metadata Corrected
Sep 04, 2026 - 05:40 vuln.today
tag: Information Disclosure removed
Analysis Generated
Sep 04, 2026 - 05:28 vuln.today
CVSS changed
Sep 04, 2026 - 05:22 NVD
7.3 (HIGH)
Patch available
Sep 03, 2026 - 10:16 EUVD
CVE Published
Sep 03, 2026 - 08:21 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 03, 2026 - 08:21 cve.org
HIGH 7.3

DescriptionCVE.org

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

bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie

bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie accept a socket pointer 'sk' with argument type ARG_PTR_TO_BTF_ID_SOCK_COMMON. However, they access sk->sk_protocol without validating whether 'sk' represents a full socket.

Fix this issue by checking sk->sk_state != TCP_LISTEN before inspecting sk->sk_protocol in both bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie. Since mini-sockets are never in the TCP_LISTEN state, the condition short-circuits and prevents dereferencing fullsock-specific fields.

AnalysisAI

Type-confusion memory access in the Linux kernel BPF subsystem allows a local attacker with BPF-capable privileges to read or corrupt kernel memory via the bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie helpers. Both helpers accept a generic sock_common pointer (ARG_PTR_TO_BTF_ID_SOCK_COMMON) but dereference fullsock-specific fields without first confirming the socket is in TCP_LISTEN state, meaning a mini-socket passed to either helper causes an out-of-bounds struct field access. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires local access to the target system and the ability to load and attach BPF programs, which demands CAP_BPF or CAP_NET_ADMIN - capabilities unavailable to ordinary unprivileged users on default Linux configurations. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world exploitation risk is moderate despite the 7.3 base score. … 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 Apply the upstream kernel patches available via the Linux stable git repository: for one stable branch, cherry-pick or upgrade to a build including commit 31a420a822ff92e2090bd5d65efe8e34e2d6d9b8 (https://git.kernel.org/stable/c/31a420a822ff92e2090bd5d65efe8e34e2d6d9b8); for a second stable branch, apply commit 23f682083aa3fbc0c49667818efd6979a8bc5ac2 (https://git.kernel.org/stable/c/23f682083aa3fbc0c49667818efd6979a8bc5ac2). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Linux systems with BPF capabilities, especially those running container platforms and multi-tenant workloads. …

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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-2026-80738 vulnerability details – vuln.today
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