CVE-2026-46244 (GCVE-0-2026-46244)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:48 – Updated: 2026-06-14 18:05
VLAI
Title
netfilter: nft_inner: Fix IPv6 inner_thoff desync
Summary
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.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < c161ad9157f5a0429b5ff94d9770faf3bf48d273 (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 870d59e2cf218e7418491e26bad768cb16654582 (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 689bbf48c1f45130086ae1c46ab83ea4c753c601 (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce (git)
Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < b6a91f68ebfed9c38e0e9150f58a9b85da07181c (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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