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CVE-2026-80738

7.3 · HIGH

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…

Published Sep 3, 2026EPSS 0.17%

Overview

CVE-2026-80738 is a high-severity vulnerability. It was published on September 3, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/22c2169770ad3b3595690e51caac875178cf496dRefgit.kernel.org/stable/c/23f682083aa3fbc0c49667818efd6979a8bc5ac2Refgit.kernel.org/stable/c/31a420a822ff92e2090bd5d65efe8e34e2d6d9b8Refgit.kernel.org/stable/c/5702e4c259809c760912c477c4ae34e9217bb4d9Refgit.kernel.org/stable/c/b5525e853a2a08a9559adb84b0616025958dc542Refgit.kernel.org/stable/c/b75f1c071f31be7f4b950721e04240c250091ad4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80738?

CVE-2026-80738 is a high-severity vulnerability. It was published on September 3, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-80738?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-80738?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-80738?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80738 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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