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CVE-2026-52915

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors, but hbh…

Published Jun 24, 2026CWE-129EPSS 0.13%

Overview

CVE-2026-52915 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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:

netfilter: ip6t_hbh: reject oversized option lists

struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors,

but hbh_mt6_check() does not reject larger optsnr values supplied from

userspace.

Validate optsnr in the rule setup path so only match data that fits the

fixed-size opts array can be installed. This follows the existing xtables

pattern of rejecting invalid user-provided counts in checkentry() and

keeps the packet matching path unchanged.

`struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array,

where `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible:

[ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29

[ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'

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/2d523ba48d4ecc46acfb6aba548292cfcce1ac02Refgit.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3eRefgit.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8Refgit.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412Refgit.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3Refgit.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7Refgit.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39Refgit.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52915?

CVE-2026-52915 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-52915?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-52915?

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-2026-52915?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52915 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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