CVE-2026-52915High· 7.1▾ TwilightIn 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 opts…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.1%
Last analysed / modified upstream
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]'
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2d523ba48d4ecc46acfb6aba548292cfcce1ac02Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 588933f1a2ca5ff99274f8c9f25dc3a25d0191c3Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 784aadea7a108c9f90985683caa87fb0198c6a39Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 41ec2e242f1702e8370ddfe14d22b7a766021c3eLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < db0250470f023f159094052c0bd5ab026a88ae93Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 57b0ac5e1b46f1f0338dff392ef2092e2871b412Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6feb43c0995ab3a9c826707eb46541a1696fe4f7Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4322dcde6b4173c2d8e8e6118ed290794263bcc8Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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