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Vulnerability record · CVE-2026-52915 · published 24 June 2026

CVE-2026-52915: Linux kernel vulnerability

Linux · Linux Kernel

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]'

7.1 CVSS 3.1 High EPSS 0.17% · top 94.7% CWE-129 · CWE-129
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

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]'

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02 Patch
https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e Patch
https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8 Patch
https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412 Patch
https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3 Patch
https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7 Patch
https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39 Patch
https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-52915), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.