{"id":"CVE-2026-72417","summary":"netfilter: flowtable: Validate iph-\u003eihl in nf_flow_ip4_tunnel_proto()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: Validate iph-\u003eihl in nf_flow_ip4_tunnel_proto()\n\nAdd sanity check for iph-\u003eihl field in nf_flow_ip4_tunnel_proto() before\nusing it to compute the header size, avoiding out-of-bounds access with\nmalformed IP headers.\nWhile at it, use iph-\u003eprotocol instead of the hardcoded IPPROTO_IPIP\nconstant when setting ctx-\u003etun.proto and reference ctx-\u003etun.hdr_size\nwhen updating ctx-\u003eoffset.","modified":"2026-08-18T03:56:25.202793373Z","published":"2026-08-15T05:56:37.547Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72417.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/025a41e76b51fbc7b8eaa5bacbaa9621d00e6aa7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84460b644329e25809b4a6d9279d6359d7fd8ebc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72417.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72417"},{"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":"ab427db17885814069bae891834f20842f0ac3a4"},{"fixed":"025a41e76b51fbc7b8eaa5bacbaa9621d00e6aa7"},{"fixed":"84460b644329e25809b4a6d9279d6359d7fd8ebc"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72417.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72417.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}