{"id":"CVE-2026-46244","summary":"netfilter: nft_inner: Fix IPv6 inner_thoff desync","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_inner: Fix IPv6 inner_thoff desync\n\nIn nft_inner_parse_l2l3(), when processing inner IPv6 packets,\nipv6_find_hdr() correctly computes the transport header offset\ntraversing all extension headers, but the result is immediately\noverwritten with nhoff + sizeof(_ip6h) (40 bytes), which only\naccounts for the IPv6 base header. This creates a desync between\ninner_thoff (wrong — points to extension header start) and l4proto\n(correct — e.g., IPPROTO_TCP), enabling transport header forgery\nand potential firewall bypass. This issue affects stable versions\nfrom Linux 6.2.\n\nFor comparison, the normal (non-inner) IPv6 path correctly\npreserves ipv6_find_hdr()'s result. Removing the incorrect overwrite\nensures that ipv6_find_hdr()'s calculated transport header offset is\npreserved, thereby fixing the desynchronization.","modified":"2026-07-04T04:01:56.751076410Z","published":"2026-06-03T15:48:59.049Z","related":["SUSE-SU-2026:22433-1","SUSE-SU-2026:22436-1","SUSE-SU-2026:2722-1","openSUSE-SU-2026:11014-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46244.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601"},{"type":"WEB","url":"https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46244.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:33215"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34094"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34443"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34911"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-46244"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46244.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46244"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2484451"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3a07327d10a09379315c844c63f27941f5081e0a"},{"fixed":"c161ad9157f5a0429b5ff94d9770faf3bf48d273"},{"fixed":"870d59e2cf218e7418491e26bad768cb16654582"},{"fixed":"689bbf48c1f45130086ae1c46ab83ea4c753c601"},{"fixed":"d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce"},{"fixed":"b6a91f68ebfed9c38e0e9150f58a9b85da07181c"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46244.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46244.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}