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CVE-2026-46244
published 2026-06-03

CVE-2026-46244: In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: Fix IPv6 inner_thoff desync In nft_inner_parse_l2l3(), when…

PriorityP353critical9.1CVSS 3.1
AVNACLPRNUINSUCHIHAN
EPSS
0.32%
24.3th percentile
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.

Affected

45 ranges· showing 25
VendorProductVersion rangeFixed in
linuxlinux
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < c161ad9157f5a0429b5ff94d9770faf3bf48d273c161ad9157f5a0429b5ff94d9770faf3bf48d273
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < 870d59e2cf218e7418491e26bad768cb16654582870d59e2cf218e7418491e26bad768cb16654582
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < 689bbf48c1f45130086ae1c46ab83ea4c753c601689bbf48c1f45130086ae1c46ab83ea4c753c601
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ced0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce
linuxlinux>= 3a07327d10a09379315c844c63f27941f5081e0a < b6a91f68ebfed9c38e0e9150f58a9b85da07181cb6a91f68ebfed9c38e0e9150f58a9b85da07181c
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel>= 6.13 < 6.18.346.18.34
linuxlinux_kernel>= 6.19 < 7.0.117.0.11
linuxlinux_kernel>= 6.2 < 6.6.1426.6.142
linuxlinux_kernel>= 6.7 < 6.12.926.12.92
ubuntulinux
ubuntulinux-aws
ubuntulinux-aws-6.8
ubuntulinux-aws-fips
ubuntulinux-azure-fips
ubuntulinux-fips
ubuntulinux-gcp
ubuntulinux-gcp-6.8
ubuntulinux-gcp-fips
ubuntulinux-gke

CVSS provenance

nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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