CriticalFix available

netfilter: nft_inner: Fix IPv6 inner_thoff desync

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.12.92, 6.18.34, 6.6.142, 7.0.11
CVEs: CVE-2026-46244
Confirmed fixed CVEs: Not specified
Updated in this feed: 7 Nov 2026, 13:24 UTC · Revision 1

Source evidence

netfilter: nft_inner: Fix IPv6 inner_thoff desync

core-osv · Original source

Published 3 Jun 2026, 15:48 UTC

osv:CVE-2026-46244

Kernel

Fixed versions: 6.6.142, 6.12.92, 6.18.34, 7.0.11

Complete source record

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    "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.",
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  "published_at": "2026-06-03T15:48:59.049+00:00"
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