Linux Kernel nft_inner IPv6 inner_thoff desync Fix
CVE-2026-46244 Published on June 3, 2026

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.

NVD

Vulnerability Analysis

CVE-2026-46244 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a high impact on availability.

Attack Vector:

LOCAL

Attack Complexity:

LOW

Privileges Required:

LOW

User Interaction:

NONE

Scope:

UNCHANGED

Confidentiality Impact:

HIGH

Integrity Impact:

LOW

Availability Impact:

HIGH

Weakness Type

What is an Untrusted pointer offset Vulnerability?

The program 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.

CVE-2026-46244 has been classified to as an Untrusted pointer offset vulnerability or weakness.

Products Associated with CVE-2026-46244

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Linux Kernel

Red Hat Enterprise Linux Eus

Red Hat Enterprise Linux (RHEL)

Canonical Ubuntu Linux

Red Hat Rhel E4s

Red Hat Rhel Eus

Affected Versions

Linux:

Version 3a07327d10a09379315c844c63f27941f5081e0a and below c161ad9157f5a0429b5ff94d9770faf3bf48d273 is affected.
Version 3a07327d10a09379315c844c63f27941f5081e0a and below 870d59e2cf218e7418491e26bad768cb16654582 is affected.
Version 3a07327d10a09379315c844c63f27941f5081e0a and below 689bbf48c1f45130086ae1c46ab83ea4c753c601 is affected.
Version 3a07327d10a09379315c844c63f27941f5081e0a and below d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce is affected.
Version 3a07327d10a09379315c844c63f27941f5081e0a and below b6a91f68ebfed9c38e0e9150f58a9b85da07181c is affected.

Linux:

Version 6.2 is affected.
Before 6.2 is unaffected.
Version 6.6.142, <= 6.6.* is unaffected.
Version 6.12.92, <= 6.12.* is unaffected.
Version 6.18.34, <= 6.18.* is unaffected.
Version 7.0.11, <= 7.0.* is unaffected.
Version 7.1, <= * is unaffected.

Red Hat Enterprise Linux 10:

Version 0:6.12.0-211.30.1.el10_2 and below * is unaffected.

Red Hat Enterprise Linux 10.0 Extended Update Support:

Version 0:6.12.0-55.84.1.el10_0 and below * is unaffected.

Red Hat Enterprise Linux 9:

Version 0:5.14.0-687.22.1.el9_8 and below * is unaffected.

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions:

Version 0:5.14.0-427.135.1.el9_4 and below * is unaffected.

Red Hat Enterprise Linux 9.6 Extended Update Support:

Version 0:5.14.0-570.125.1.el9_6 and below * is unaffected.

Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9:

Exploit Probability

EPSS

0.39%

Percentile

30.79%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.