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CVE-2026-46244 is a transport-header interpretation vulnerability in the Linux kernel's netfilter nft_inner component, affecting upstream stable kernels beginning with Linux 6.2. When nft_inner_parse_l2l3() processes inner IPv6 packets, ipv6_find_hdr() correctly traverses extension headers to calculate the transport-header offset. The vulnerable code then overwrites that offset with nhoff + sizeof(_ip6h), accounting only for the 40-byte IPv6 base header. Consequently, inner_thoff points to the extension-header start while l4proto retains the actual transport protocol. This mismatch enables transport-header forgery and potential firewall bypass. The normal, non-inner IPv6 processing path preserves the correct offset.
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A Linux kernel netfilter nft_inner vulnerability affecting stable versions from Linux 6.2. When parsing inner IPv6 packets containing extension headers, an incorrect overwrite desynchronizes the transport header offset from the correctly identified transport protocol. This enables transport header forgery and potential firewall bypass. The fix preserves the offset calculated by ipv6_find_hdr(). The plugin reports a CVSS v3 base score of 7.3.
A Linux kernel Netfilter vulnerability in nft_inner_parse_l2l3() incorrectly overwrites the calculated transport-header offset for inner IPv6 packets containing extension headers. The resulting mismatch between the header offset and protocol identification enables transport-header forgery and potential firewall bypass. The advisory identifies affected Google COS kernel packages and recommends updating to version 18613.613.56 or later.
A Linux kernel netfilter nft_inner vulnerability involving an IPv6 inner_thoff desynchronization issue.
Linux kernel vulnerability in netfilter nft_inner involving an IPv6 inner_thoff desynchronization issue.
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Cross-references every affected SKU, including bundled OEM variants.
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