CVE-2026-52915

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]'