{"schema":"threatline.record/2","record":{"id":"CVE-2026-98303","aliases":[],"summary":"ipv4: icmp: reject RTN_UNREACHABLE input routes in icmp_route_lookup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: icmp: reject RTN_UNREACHABLE input routes in icmp_route_lookup\n\nWhen the forward output route cannot be used in icmp_route_lookup(),\nit enters the \"reverse path\" and calls ip_route_input() on fl4_dec.daddr,\nthe original packet's source address.\n\nip_route_input() only returns an error for truly invalid packets. For\nunreachable addresses it will succeed and return an input route whose\ndst.output is set to ip_rt_bug(). The existing check only rejects\nRTN_LOCAL routes, so the RTN_UNREACHABLE route types can still be returned\nand later used for output, syzkaller triggering a WARN_ON_ONCE()\nin ip_rt_bug() as bellow:\n\n ------------[ cut here ]------------\n WARNING: net/ipv4/route.c:1273 at ip_rt_bug+0x14/0x20\n RIP: 0010:ip_rt_bug+0x14/0x20\n Call Trace:\n  ip_push_pending_frames+0xfa/0x100\n  __icmp_send+0x905/0xf10\n  ip_options_compile+0xc0/0xd0\n  ip_rcv_finish_core+0x321/0xae0\n  ip_rcv+0x1de/0x260\n  __netif_receive_skb_one_core+0x11a/0x130\n  netif_receive_skb+0x7b/0x260\n  tun_get_user+0x11bf/0x1c10\n ------------[ cut here ]------------\n\nReject input route that is RTN_UNREACHABLE to fix it. The net warning\nis only printed for RTN_LOCAL, as RTN_UNREACHABLE is not the result of\na race condition.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98303","source_modified_at":"2026-10-19T09:17:14.136Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"8b7817f3a959ed99d7443afc12f78a7e1fcc2063","lessThan":"06083cea4a3b95f5ebc85312f97d7086e6c9e782","status":"affected","versionType":"git"},{"version":"8b7817f3a959ed99d7443afc12f78a7e1fcc2063","lessThan":"83aa83f81a8fec30ff5372dee60b2f0561bcb2ca","status":"affected","versionType":"git"},{"version":"8b7817f3a959ed99d7443afc12f78a7e1fcc2063","lessThan":"cac69c50716c712ef0114837c9427da66066124c","status":"affected","versionType":"git"},{"version":"8b7817f3a959ed99d7443afc12f78a7e1fcc2063","lessThan":"1af2d87964d87ba7626d96928d68c09158b5a223","status":"affected","versionType":"git"},{"version":"8b7817f3a959ed99d7443afc12f78a7e1fcc2063","lessThan":"fda3000147dc96c75ba162f680bec0a9fecf3037","status":"affected","versionType":"git"},{"version":"8b7817f3a959ed99d7443afc12f78a7e1fcc2063","lessThan":"2998147b59c9df0a51477c7a6b3d1f0ba3127dd4","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98303","source_modified_at":"2026-10-19T09:17:14.136Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","lessThan":"2.6.25","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","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-2026-98303","source_modified_at":"2026-10-19T09:17:14.136Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"06083cea4a3b95f5ebc85312f97d7086e6c9e782","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98303","source_modified_at":"2026-10-19T09:17:14.136Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"83aa83f81a8fec30ff5372dee60b2f0561bcb2ca","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98303","source_modified_at":"2026-10-19T09:17:14.136Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"1af2d87964d87ba7626d96928d68c09158b5a223","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98303","source_modified_at":"2026-10-19T09:17:14.136Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2998147b59c9df0a51477c7a6b3d1f0ba3127dd4","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.0018,"percentile":0.07204,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:46:00.524Z","modified_at":"2026-10-19T09:17:14.136Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98303","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:17:14.136Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98303","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/06083cea4a3b95f5ebc85312f97d7086e6c9e782"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/83aa83f81a8fec30ff5372dee60b2f0561bcb2ca"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cac69c50716c712ef0114837c9427da66066124c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1af2d87964d87ba7626d96928d68c09158b5a223"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/fda3000147dc96c75ba162f680bec0a9fecf3037"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2998147b59c9df0a51477c7a6b3d1f0ba3127dd4"}],"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":"2026-10-19T09:17:14.136Z","content_hash":"c15e58ea1805d48c55effb51ec157c94e9a07675dcb55d7de8304f53128b726c"}}