CVE-2026-46244 is a vulnerability in Linux Kernel
Published on June 3, 2026
netfilter: nft_inner: Fix IPv6 inner_thoff desync
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.
Products Associated with CVE-2026-46244
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Affected Versions
Linux:- Version 3a07327d10a09379315c844c63f27941f5081e0a and below c161ad9157f5a0429b5ff94d9770faf3bf48d273 is affected.
- Version 3a07327d10a09379315c844c63f27941f5081e0a and below 870d59e2cf218e7418491e26bad768cb16654582 is affected.
- Version 3a07327d10a09379315c844c63f27941f5081e0a and below 689bbf48c1f45130086ae1c46ab83ea4c753c601 is affected.
- Version 3a07327d10a09379315c844c63f27941f5081e0a and below d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce is affected.
- Version 3a07327d10a09379315c844c63f27941f5081e0a and below b6a91f68ebfed9c38e0e9150f58a9b85da07181c is affected.
- Version 6.2 is affected.
- Before 6.2 is unaffected.
- Version 6.6.142, <= 6.6.* is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1-rc5, <= * is unaffected.