9.1

CVE-2026-46244

netfilter: nft_inner: Fix IPv6 inner_thoff desync

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.142
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.92
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.34
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.11
Linux ≫ Linux Kernel Version7.1 Updaterc1
Linux ≫ Linux Kernel Version7.1 Updaterc2
Linux ≫ Linux Kernel Version7.1 Updaterc3
Linux ≫ Linux Kernel Version7.1 Updaterc4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.32% 0.241
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.3 1.8 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE-823 Use of Out-of-range Pointer Offset

The product performs pointer arithmetic on a valid pointer, but it uses an offset that can point outside of the intended range of valid memory locations for the resulting pointer.

https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273
Patch
https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582
Patch
https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601
Patch
https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce
Patch
https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c
Patch
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-2026:34911
https://access.redhat.com/errata/RHSA-2026:36018
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/security/cve/CVE-2026-46244