CVE-2026-46244

Advisory lineage Upstream: 0 Downstream: 18
Analyzed
Published: 03 Jun 2026, 15:48
Last modified:15 Jul 2026, 00:50

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.1 CRITICAL
v3.1 (cve.org)
EPSS Score
0.31% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

03 Jun 2026, 15:48
Published
Vulnerability first disclosed
15 Jul 2026, 00:50
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•CRITICAL•Score: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.31%• Percentile: 23%

Techniques & Countermeasures

  • 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.

Affected Systems

  • linux•linux

    ≥ 3a07327d10a09379315c844c63f27941f5081e0a, < c161ad9157f5a0429b5ff94d9770faf3bf48d273 | ≥ 3a07327d10a09379315c844c63f27941f5081e0a, < 870d59e2cf218e7418491e26bad768cb16654582 | ≥ 3a07327d10a09379315c844c63f27941f5081e0a, < 689bbf48c1f45130086ae1c46ab83ea4c753c601 | ≥ 3a07327d10a09379315c844c63f27941f5081e0a, < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce | ≥ 3a07327d10a09379315c844c63f27941f5081e0a, < b6a91f68ebfed9c38e0e9150f58a9b85da07181c | 6.2

  • linux•linux kernel

    ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4

References (13)