CVE-2026-46244 (GCVE-0-2026-46244)
Vulnerability from cvelistv5
Published
2026-06-03 15:48
Modified
2026-08-19 12:05
Severity ?
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.
Impacted products
Vendor Product Version
Linux Linux Version: 3a07327d10a09379315c844c63f27941f5081e0a
Version: 3a07327d10a09379315c844c63f27941f5081e0a
Version: 3a07327d10a09379315c844c63f27941f5081e0a
Version: 3a07327d10a09379315c844c63f27941f5081e0a
Version: 3a07327d10a09379315c844c63f27941f5081e0a
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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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