Description
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.
Product status
3a07327d10a09379315c844c63f27941f5081e0a (git) before c161ad9157f5a0429b5ff94d9770faf3bf48d273
3a07327d10a09379315c844c63f27941f5081e0a (git) before 870d59e2cf218e7418491e26bad768cb16654582
3a07327d10a09379315c844c63f27941f5081e0a (git) before 689bbf48c1f45130086ae1c46ab83ea4c753c601
3a07327d10a09379315c844c63f27941f5081e0a (git) before d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce
3a07327d10a09379315c844c63f27941f5081e0a (git) before b6a91f68ebfed9c38e0e9150f58a9b85da07181c
6.2
Any version before 6.2
6.6.142 (semver)
6.12.92 (semver)
6.18.34 (semver)
7.0.11 (semver)
7.1-rc5 (original_commit_for_fix)
References
git.kernel.org/...c/c161ad9157f5a0429b5ff94d9770faf3bf48d273
git.kernel.org/...c/870d59e2cf218e7418491e26bad768cb16654582
git.kernel.org/...c/689bbf48c1f45130086ae1c46ab83ea4c753c601
git.kernel.org/...c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce
git.kernel.org/...c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c