{"id":"CVE-2026-80664","summary":"netfilter: xt_nat: reject unsupported target families","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_nat: reject unsupported target families\n\nxt_nat SNAT and DNAT target handlers assume IP-family conntrack state\nis present and can dereference a NULL pointer when instantiated from an\nunsupported family through nft_compat. A bridge-family compat rule can\ntherefore trigger a NULL-dereference in nf_nat_setup_info().\n\nReject non-IP families in xt_nat_checkentry() so unsupported targets\ncannot be installed. Keep NFPROTO_INET allowed for valid inet NAT\ncompat users and leave the runtime fast path unchanged.\n\n[ The crash was fixed via\n  9dbba7e694ec (\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\"),\n  so this patch is no longer critical.\n  Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra\n  family check is a good idea in any case. ]","modified":"2026-08-31T03:30:39.271510471Z","published":"2026-08-28T06:49:07.478Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80664.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82"},{"type":"WEB","url":"https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80664.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80664"},{"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":"c7232c9979cba684c50b64c513c4a83c9aa70563"},{"fixed":"49abe564391411057a26a9a943c8e17867c3b9b4"},{"fixed":"0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82"},{"fixed":"4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"},{"fixed":"a842dab87cab29f2a5798a47b2dc5e6a449950bf"},{"fixed":"e35c048d7511e9d4c2a537b8a231c49606e97c16"},{"fixed":"679ced28a9dc2f6dc679eb05027d779693e60902"},{"fixed":"ec88fa71c82072e9189983b05b499d3507550271"},{"fixed":"5d1a2240935ea47e2673d0ea17fdb058e4dc91dd"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-80664.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.7.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-80664.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H"}]}