CVE-2026-46244netfilter: nft_inner: Fix IPv6 inner_thoff desync
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-823
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3a07327d10a09379315c844c63f27941f5081e0a before c161ad9157f5a0429b5ff94d9770faf3bf48d273; from 3a07327d10a09379315c844c63f27941f5081e0a before 870d59e2cf218e7418491e26bad768cb16654582; from 3a07327d10a09379315c844c63f27941f5081e0a before 689bbf48c1f45130086ae1c46ab83ea4c753c601; from 3a07327d10a09379315c844c63f27941f5081e0a before d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce; from 3a07327d10a09379315c844c63f27941f5081e0a before b6a91f68ebfed9c38e0e9150f58a9b85da07181c | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:6.12.0-211.30.1.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:6.12.0-55.84.1.el10_0 not affected | CISA ADP |
from 0:5.14.0-427.135.1.el9_4 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:5.14.0-570.125.1.el9_6 not affected | CISA ADP |
linux linux_kernel linux:linux_kernel | from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273patch
- https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582patch
- https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601patch
- https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279cepatch
- https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181cpatch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.