CVE-2026-52915netfilter: ip6t_hbh: reject oversized option lists
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2d523ba48d4ecc46acfb6aba548292cfcce1ac02; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 588933f1a2ca5ff99274f8c9f25dc3a25d0191c3; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 784aadea7a108c9f90985683caa87fb0198c6a39; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 41ec2e242f1702e8370ddfe14d22b7a766021c3e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before db0250470f023f159094052c0bd5ab026a88ae93; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 57b0ac5e1b46f1f0338dff392ef2092e2871b412; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6feb43c0995ab3a9c826707eb46541a1696fe4f7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4322dcde6b4173c2d8e8e6118ed290794263bcc8 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.12.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 2.6.12; and 8 more ranges | NVD |
References
- https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02patch
- https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3patch
- https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39patch
- https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3epatch
- https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93patch
- https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412patch
- https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7patch
- https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.