CRITICAL: CVE-2026-46244 (CVSS 9.1) — multiple products

CVE: CVE-2026-46244

CVSS: 9.1 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: CRITICAL

Status: Critical advisory

Affected

_See vendor advisory_

Summary

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_inner: Fix IPv6 inner_thoff desync

In nft_inner_parse_l2l3(), when processing inner IPv6 packets,

ipv6_find_hdr() correctly computes the transport header offset

traversing all extension headers, but the result is immediately

overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only

accounts for the IPv6 base header. This creates a desync between

inner_thoff (wrong — points to extension header start) and l4proto

(correct — e.g., IPPROTO_TCP), enabling transport header forgery

and potential firewall bypass. This issue affects stable versions

from Linux 6.2.

For comparison, the normal (non-inner) IPv6 path correctly

preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite

ensures that ipv6_find_hdr()'s calculated transport header offset is

preserved, thereby fixing the desynchronization.

Verified Sources

• NVD entry
• GitHub Advisory
• MITRE

References

• https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601
• https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582
• https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c
• https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273
• https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._