{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"f0d88a4cd03affff6c08adf6c63964e235aede43","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"},{"lessThan":"27ddf4486c7dbf5bdd393fa8bef6b67179796d98","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"},{"lessThan":"782708ca1ea1f68b8cbb5ea3a7f5f18d0000efae","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"},{"lessThan":"e81f805824a8109504fce090641b17d135b48cd1","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"},{"lessThan":"99206ce2244f8a3ed64298d0667c9055845a5dc7","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"},{"lessThan":"bbae351c0f32f7c200249e4aa6561b2b419dcf69","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"},{"lessThan":"a094ac95d3b69adfa1676eb9c8eae6835d4f1671","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"},{"lessThan":"efb8763d7bbb40cff4cc55a6b62c3095a038149c","status":"affected","version":"91cc17c0e5e5ada156a8d5787a2509d263ea6bbf","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"2.6.24"},{"lessThan":"2.6.24","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]}],"cveId":"CVE-2026-64422","cwes":["CWE-190"],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv4: bound TCP reordering sysctl writes and MTU probe sizes\n\nReject invalid `net.ipv4.tcp_reordering` values before they reach TCP\nsocket state. The sysctl is stored as an `int` but copied into the\n`u32` `tp->reordering` field for new sockets, so negative writes wrap\nto large values.\n\nWith `tcp_mtu_probing=2`, the wrapped value can overflow the\n`tcp_mtu_probe()` size calculation and drive the MTU probing path into\nan out-of-bounds read. Route `tcp_reordering` writes through\n`proc_dointvec_minmax()` and require it to be at least 1. Also require\n`tcp_max_reordering` to be at least 1 so the configured maximum cannot\nbecome negative either.\n\nWhen registering the table for a non-init network namespace, relocate\n`extra2` pointers that refer into `init_net.ipv4` so the\n`tcp_reordering` upper bound follows that namespace's\n`tcp_max_reordering`.\n\nHarden `tcp_mtu_probe()` itself by computing `size_needed` as `u64`.\nThis keeps the send queue and window checks from being bypassed through\nsigned integer overflow.","epss":{"date":"2026-11-09","percentile":0.03237,"score":0.00138},"exploits":[],"kev":null,"metrics":[{"score":7.1,"severity":"high","source":"CNA: Linux","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}],"modifiedAt":1794314959602,"publishedAt":1784969460671,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/f0d88a4cd03affff6c08adf6c63964e235aede43"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/27ddf4486c7dbf5bdd393fa8bef6b67179796d98"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/782708ca1ea1f68b8cbb5ea3a7f5f18d0000efae"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/e81f805824a8109504fce090641b17d135b48cd1"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/99206ce2244f8a3ed64298d0667c9055845a5dc7"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/bbae351c0f32f7c200249e4aa6561b2b419dcf69"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/a094ac95d3b69adfa1676eb9c8eae6835d4f1671"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/efb8763d7bbb40cff4cc55a6b62c3095a038149c"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}],"remediation":[],"revision":"6abf6a69376ee8fa91ec439b09e5c812ef6a8488af0c7344bccf24f3cb897d5a","sources":[{"modifiedAt":1794314959602,"name":"CNA: Linux","retrievedAt":1794316736662,"url":"https://www.cve.org/CVERecord?id=CVE-2026-64422"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794316747636,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-64422"}],"ssvc":{"assessedAt":1792165228975,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes","updatedAt":1794316747636}