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Vulnerability record · CVE-2026-46244 · published 3 June 2026

CVE-2026-46244: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.1 CVSS 3.1 Critical EPSS 0.46% · top 62.9% CWE-823 · CWE-823
9.1CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
16References
19 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601 Patch
https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582 Patch
https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c Patch
https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273 Patch
https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce Patch
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

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Source: NIST National Vulnerability Database (record CVE-2026-46244), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.