CVE-2026-52915 Details
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]'
A vulnerability exists in the Linux kernel's netfilter component, specifically within the ip6t_hbh module. The issue arises because the struct ip6t_opts can only accommodate a maximum of 16 option descriptors. However, the hbh_mt6_check function fails to properly validate larger option counts received from userspace, leading to a potential off-by-one array access error. This vulnerability allows for an array-index-out-of-bounds condition, as the function does not reject invalid user-supplied counts before they are processed.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02 | kernel.org | Patch |
| https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e | kernel.org | Patch |
| https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8 | kernel.org | Patch |
| https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412 | kernel.org | Patch |
| https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7 | kernel.org | Patch |
| https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39 | kernel.org | Patch |
| https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-129 | Improper Validation of Array Index | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.12.1, < 5.10.258 >= 5.11, < 5.15.209 >= 5.16, < 6.1.175 >= 6.2, < 6.6.142 >= 6.7, < 6.12.92 >= 6.13, < 6.18.34 >= 6.19, < 7.0.11 2.6.12 - 2.6.12 rc2 2.6.12 rc3 2.6.12 rc4 2.6.12 rc5 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 8, 2026 | Initial Analysis | [email protected] |
| Jun 28, 2026 | CVE Modified | kernel.org |
| Jun 24, 2026 | New CVE Received | kernel.org |