{"id":"CVE-2026-72417","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72417","summary":"netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()\n\nAdd sanity check for iph->ihl 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->protocol instead of the hardcoded IPPROTO_IPIP\nconstant when setting ctx->tun.proto and reference ctx->tun.hdr_size\nwhen updating ctx->offset.","published":"2026-08-15T05:56:37.547Z","modified":"2026-08-18T03:56:25.202793373Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"7.1.5"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:25.202793373Z"}}