CVE-2026-52915

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-52915

Key Details

CVE	CVE-2026-52915
CVSS Score / Version	7.1 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is none; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-129 (Improper Validation of Array Index)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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]' (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-52915
CVE	https://www.cve.org/CVERecord?id=CVE-2026-52915

Source

Reference

NVD

CVE