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CVE-2026-46244 is a Linux kernel netfilter flaw in nft_inner_parse_l2l3() affecting processing of inner IPv6 packets. When parsing encapsulated IPv6 traffic, ipv6_find_hdr() correctly walks IPv6 extension headers and computes the true transport header offset, but that result is then incorrectly overwritten with nhoff + sizeof(struct ipv6hdr), i.e. the fixed 40-byte base IPv6 header length. This causes a desynchronization between inner_thoff, which incorrectly points to the start of the extension-header chain, and l4proto, which still reflects the actual upper-layer protocol such as TCP. The mismatch can let crafted inner IPv6 packets with extension headers be interpreted inconsistently during filtering, enabling transport-header forgery and incorrect netfilter policy evaluation. The issue affects stable Linux kernel versions from 6.2.
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Cross-references every affected SKU, including bundled OEM variants.
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