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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 3a07327d10a09379315c844c63f27941f5081e0a, < c161ad9157f5a0429b5ff94d9770faf3bf48d273; >= 3a07327d10a09379315c844c63f27941f5081e0a, < 870d59e2cf218e7418491e26bad768cb16654582; >= 3a07327d10a09379315c844c63f27941f5081e0a, < 689bbf48c1f45130086ae1c46ab83ea4c753c601; >= 3a07327d10a09379315c844c63f27941f5081e0a, < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce; >= 3a07327d10a09379315c844c63f27941f5081e0a, < b6a91f68ebfed9c38e0e9150f58a9b85da07181c |
| Linux | Linux | 6.2 |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 6 | — |
| Red Hat | Red Hat Enterprise Linux 7 | — |
| Red Hat | Red Hat Enterprise Linux 7 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
References
- https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601Patch
- https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582Patch
- https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181cPatch
- https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273Patch
- https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279cePatch
- https://access.redhat.com/errata/RHSA-2026:33215
- https://access.redhat.com/errata/RHSA-2026:34094
- https://access.redhat.com/errata/RHSA-2026:34443
- https://access.redhat.com/errata/RHSA-2026:34911
- https://access.redhat.com/errata/RHSA-2026:36018
- https://access.redhat.com/errata/RHSA-2026:55618
- https://access.redhat.com/errata/RHSA-2026:55763
- https://access.redhat.com/errata/RHSA-2026:56225
- 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
Timeline
- Published
- Jun 3, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Modified