{"schema":"threatline.record/2","record":{"id":"CVE-2026-98240","aliases":[],"summary":"net: ip_tunnel: initialize `options_len` before referencing options","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ip_tunnel: initialize `options_len` before referencing options\n\nThe following command triggers a kernel panic:\n\n  ip link add d0 type dummy; ip link set d0 up\n  ip route add 10.30.0.0/16 \\\n    encap ip id 300 geneve_opts 4660:66:11223344 dev d0\n\n  memcpy: detected buffer overflow: 4 byte write of buffer size 0\n  kernel BUG at lib/string_helpers.c:1044!\n  ...\n  ip_tun_parse_opts.part.0.cold+0x10/0x10\n  ip_tun_build_state+0x116/0x2a0\n\nOn kernels built with GCC 15+ and `CONFIG_FORTIFY_SOURCE`, the fortified\n`memcpy()` got 0 sized destination with request of 4 bytes length:\n\n  static int ip_tun_parse_opts_geneve(...)\n  {\n      ...\n      attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];\n      data_len = nla_len(attr); /* == 4 */\n\n      struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;\n      memcpy(opt->opt_data, nla_data(attr), data_len);\n      /*     ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */\n\nFixed by initializing the counter before the options are referenced.\nMatching what `tunnel_key_opts_set()` already does.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98240","source_modified_at":"2026-10-19T09:16:11.863Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"bb5e62f2d547c4de6d1b144cbce2373a76c33f18","lessThan":"9907325257b4b382f26aafd5d9a8d47915907dd5","status":"affected","versionType":"git"},{"version":"bb5e62f2d547c4de6d1b144cbce2373a76c33f18","lessThan":"0f6a6beb01c068fcd5274eabf22c260039749fea","status":"affected","versionType":"git"},{"version":"bb5e62f2d547c4de6d1b144cbce2373a76c33f18","lessThan":"455ebeadf714f51e1dbbd6a022c74c9215b1cd76","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98240","source_modified_at":"2026-10-19T09:16:11.863Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98240","source_modified_at":"2026-10-19T09:16:11.863Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9907325257b4b382f26aafd5d9a8d47915907dd5","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98240","source_modified_at":"2026-10-19T09:16:11.863Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0f6a6beb01c068fcd5274eabf22c260039749fea","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98240","source_modified_at":"2026-10-19T09:16:11.863Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"455ebeadf714f51e1dbbd6a022c74c9215b1cd76","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00183,"percentile":0.07502,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:45:11.284Z","modified_at":"2026-10-19T09:16:11.863Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98240","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:16:11.863Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98240","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/9907325257b4b382f26aafd5d9a8d47915907dd5"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0f6a6beb01c068fcd5274eabf22c260039749fea"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/455ebeadf714f51e1dbbd6a022c74c9215b1cd76"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:16:11.863Z","content_hash":"d54db46f7dfad155f4cd9d8739bce9a4497edf0451ebdb025450ceafdd08cfa9"}}