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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
3a07327d10a09379315c844c63f27941f5081e0a to < c161ad9157f5a0429b5ff94d9770faf3bf48d273affected3a07327d10a09379315c844c63f27941f5081e0a to < 870d59e2cf218e7418491e26bad768cb16654582affected3a07327d10a09379315c844c63f27941f5081e0a to < 689bbf48c1f45130086ae1c46ab83ea4c753c601affected3a07327d10a09379315c844c63f27941f5081e0a to < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ceaffected3a07327d10a09379315c844c63f27941f5081e0a to < b6a91f68ebfed9c38e0e9150f58a9b85da07181caffected
Linux Linux
Default version status: affected
6.2affected0 to < 6.2unaffected6.6.142 to ≤ 6.6.*unaffected6.12.92 to ≤ 6.12.*unaffected6.18.34 to ≤ 6.18.*unaffected7.0.11 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273 ↗
- https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582 ↗
- https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601 ↗
- https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce ↗
- https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c ↗
- https://access.redhat.com/security/cve/CVE-2026-46244 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2484451 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46244.json ↗
- https://access.redhat.com/errata/RHSA-2026:33215 ↗
- https://access.redhat.com/errata/RHSA-2026:34911 ↗
- https://access.redhat.com/errata/RHSA-2026:34443 ↗
- https://access.redhat.com/errata/RHSA-2026:34094 ↗
- https://access.redhat.com/errata/RHSA-2026:36018 ↗
- https://access.redhat.com/errata/RHSA-2026:55618 ↗
- https://access.redhat.com/errata/RHSA-2026:56225 ↗
- https://access.redhat.com/errata/RHSA-2026:55763 ↗