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CVE-2026-72400

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: seg6: validate SRH length before reading fixed fields seg6_validate_srh() reads fixed SRH fields such as srh->type and srh->hdr…

Published Aug 15, 2026EPSS 0.18%

Overview

CVE-2026-72400 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

seg6: validate SRH length before reading fixed fields

seg6_validate_srh() reads fixed SRH fields such as srh->type and

srh->hdrlen before checking that the supplied length covers the fixed

struct ipv6_sr_hdr fields.

The BPF SEG6 encap path reaches this with a BPF program-supplied pointer

and length: bpf_lwt_push_encap() and the SEG6 local BPF END_B6 and

END_B6_ENCAP actions call bpf_push_seg6_encap(), which forwards the

length to seg6_validate_srh() with no minimum-size guard. A 2-byte SEG6

encap header can therefore make the validator read srh->type at offset 2

beyond the caller-supplied buffer.

Reject lengths shorter than the fixed SRH at the top of

seg6_validate_srh(), before any field is read. This fixes the BPF helper

path and keeps the common validator robust.

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/071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0eRefgit.kernel.org/stable/c/0fc7069d39239978130c37ebceaec85c8948d3f1Refgit.kernel.org/stable/c/715eb12e453df752f1b4baaf972c3acff0ab9402Refgit.kernel.org/stable/c/7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73Refgit.kernel.org/stable/c/804bb969f194c93497ba632b98343794c6367fdcRefgit.kernel.org/stable/c/8dba7a94a269b88e500aafc25ad567ef6a423698Refgit.kernel.org/stable/c/a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aaRefgit.kernel.org/stable/c/c9961336aa5ff83092f23e33ee86666a9dbd1b2a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72400?

CVE-2026-72400 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-72400?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-72400?

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-2026-72400?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72400 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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