{"api_version":"1","generated_at":"2026-08-22T06:11:58+00:00","cve":"CVE-2026-16661","urls":{"html":"https://cve.report/CVE-2026-16661","api":"https://cve.report/api/cve/CVE-2026-16661.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-16661","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-16661"},"summary":{"title":"Power System Integer Overflow","description":"IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can exploit this vulnerability, allowing arbitrary code to be executed in the host firmware runtime, giving full control over the managed system, resulting in a confidentiality, integrity, and availability impact to the managed system.","state":"PUBLISHED","assigner":"ibm","published_at":"2026-08-19 20:17:01","updated_at":"2026-08-22 04:17:13"},"problem_types":["CWE-190","CWE-190 CWE-190 Integer Overflow or Wraparound"],"metrics":[{"version":"3.1","source":"psirt@us.ibm.com","type":"Secondary","score":"8.2","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","baseScore":8.2,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"8.2","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","data":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://www.ibm.com/support/pages/node/7283237","name":"https://www.ibm.com/support/pages/node/7283237","refsource":"psirt@us.ibm.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-16661","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16661","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"IBM","product":"PowerVM Hypervisor","version":"affected FW1120.00","platforms":[]},{"source":"CNA","vendor":"IBM","product":"PowerVM Hypervisor","version":"affected FW1110.00 FW1110.30 semver","platforms":[]},{"source":"CNA","vendor":"IBM","product":"PowerVM Hypervisor","version":"affected FW1060.00 FW1060.80 semver","platforms":[]},{"source":"CNA","vendor":"IBM","product":"PowerVM Hypervisor","version":"affected FW950.00 FW950.H2 semver","platforms":[]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Customers with the products below should install FW1110.31(1110_134), FW1120.01(1120_167), or newer to remediate this vulnerability.\nPower 11\n\n  *  IBM Power System E1180 (9080-HEU)\n\n\nCustomers with the products below should install FW1110.31(1110_155), FW1120.01(1120_190), or newer to remediate this vulnerability.\nPower 11\n\n  *  IBM Power System S1122 (9824-22A)\n  *  IBM Power System S1124 (9824-42A)\n  *  IBM Power System S1122s (9824-22B)\n  *  IBM Power System S1114 (9824-41B)\n  *  IBM Power System L1122 (9856-22H)\n  *  IBM Power System L1124 (9856-42H)\n  *  IBM Power System E1150 (9043-MRU)\n\n\nCustomers with the products below should install FW1120.01(1120_190), or newer to remediate this vulnerability.\n\n\n\nPower 11\n\n  *  IBM Power System S1112 (9242-21B, 9242-21T)\n\n\n\nCustomers with the products below should install FW1060.81(1060_184), or newer to remediate this vulnerability.\nPower 10\n\n  *  IBM Power System E1080 (9080-HEX)\n\n\nCustomers with the products below should install  FW1060.81(1060_191), or newer to remediate this vulnerability.\nPower 10\n\n  *  IBM Power System S1022 (9105-22A)\n  *  IBM Power System S1024 (9105-42A)\n  *  IBM Power System S1022s (9105-22B)\n  *  IBM Power System S1014 (9105-41B)\n  *  IBM Power System L1022 (9786-22H)\n  *  IBM Power System L1024 (9786-42H)\n  *  IBM Power System E1050 (9043-MRX)\n  *  IBM Power System S1012 (9028-21B)\n\n\n\n\n\n\nCustomers with the products below should install FW950.H3(950_230) or newer to remediate this vulnerability.\nPower 9\n\n  *  IBM Power System S922 (9009-22G)\n  *  IBM Power System H922 (9223-22S)\n  *  IBM Power System S914 (9009-41G)\n  *  IBM Power System S924 (9009-42G)\n  *  IBM Power System H924 (9223-42S)\n  *  IBM Power System E950 (9040-MR9)\n  *  IBM Power System E980 (9080-M9S)\n\n\nThe images mentioned above can be located at IBM Fix Central :  https://www.ibm.com/support/fixcentral/ https://www.ibm.com/support/fixcentral/","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"16661","cve":"CVE-2026-16661","epss":"0.001320000","percentile":"0.032140000","score_date":"2026-08-21","updated_at":"2026-08-22 00:12:48"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-16661","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-08-21T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-08-22T03:55:52.286Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"cpes":["cpe:2.3:o:ibm:power_systems_firmware:fw1120.00:*:*:*:*:*:*:*","cpe:2.3:o:ibm:power_systems_firmware:fw1110.00:*:*:*:*:*:*:*","cpe:2.3:o:ibm:power_systems_firmware:fw1110.30:*:*:*:*:*:*:*","cpe:2.3:o:ibm:power_systems_firmware:fw1060.00:*:*:*:*:*:*:*","cpe:2.3:o:ibm:power_systems_firmware:fw1060.80:*:*:*:*:*:*:*","cpe:2.3:o:ibm:power_systems_firmware:fw950.00:*:*:*:*:*:*:*","cpe:2.3:o:ibm:power_systems_firmware:fw950.h2:*:*:*:*:*:*:*"],"product":"PowerVM Hypervisor","vendor":"IBM","versions":[{"status":"affected","version":"FW1120.00"},{"lessThanOrEqual":"FW1110.30","status":"affected","version":"FW1110.00","versionType":"semver"},{"lessThanOrEqual":"FW1060.80","status":"affected","version":"FW1060.00","versionType":"semver"},{"lessThanOrEqual":"FW950.H2","status":"affected","version":"FW950.00","versionType":"semver"}]}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can exploit this vulnerability, allowing arbitrary code to be executed in the host firmware runtime, giving full control over the managed system, resulting in a confidentiality, integrity, and availability impact to the managed system.</p>"}],"value":"IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can exploit this vulnerability, allowing arbitrary code to be executed in the host firmware runtime, giving full control over the managed system, resulting in a confidentiality, integrity, and availability impact to the managed system."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","description":"CWE-190 Integer Overflow or Wraparound","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-19T19:35:19.799Z","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","shortName":"ibm"},"references":[{"tags":["vendor-advisory","patch"],"url":"https://www.ibm.com/support/pages/node/7283237"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>Customers with the products below should install FW1110.31(1110_134), FW1120.01(1120_167), or newer to remediate this vulnerability.<br/>Power 11</p><ol><li>IBM Power System E1180 (9080-HEU)</li></ol><p>Customers with the products below should install FW1110.31(1110_155), FW1120.01(1120_190), or newer to remediate this vulnerability.<br/>Power 11</p><ol><li>IBM Power System S1122 (9824-22A)</li><li>IBM Power System S1124 (9824-42A)</li><li>IBM Power System S1122s (9824-22B)</li><li>IBM Power System S1114 (9824-41B)</li><li>IBM Power System L1122 (9856-22H)</li><li>IBM Power System L1124 (9856-42H)</li><li>IBM Power System E1150 (9043-MRU)</li></ol><p>Customers with the products below should install FW1120.01(1120_190), or newer to remediate this vulnerability.</p><p>Power 11</p><ol><li>IBM Power System S1112 (9242-21B, 9242-21T)</li></ol><p><br/>Customers with the products below should install FW1060.81(1060_184), or newer to remediate this vulnerability.<br/>Power 10</p><ol><li>IBM Power System E1080 (9080-HEX)</li></ol><p>Customers with the products below should install  FW1060.81(1060_191), or newer to remediate this vulnerability.<br/>Power 10</p><ol><li>IBM Power System S1022 (9105-22A)</li><li>IBM Power System S1024 (9105-42A)</li><li>IBM Power System S1022s (9105-22B)</li><li>IBM Power System S1014 (9105-41B)</li><li>IBM Power System L1022 (9786-22H)</li><li>IBM Power System L1024 (9786-42H)</li><li>IBM Power System E1050 (9043-MRX)</li><li>IBM Power System S1012 (9028-21B)</li></ol><p></p><p>Customers with the products below should install FW950.H3(950_230) or newer to remediate this vulnerability.<br/>Power 9</p><ol><li>IBM Power System S922 (9009-22G)</li><li>IBM Power System H922 (9223-22S)</li><li>IBM Power System S914 (9009-41G)</li><li>IBM Power System S924 (9009-42G)</li><li>IBM Power System H924 (9223-42S)</li><li>IBM Power System E950 (9040-MR9)</li><li>IBM Power System E980 (9080-M9S)</li></ol><p><em>The images mentioned above can be located at IBM Fix Central : </em><a href=\"https://www.ibm.com/support/fixcentral/\" rel=\"noopener noreferrer nofollow\"><em>https://www.ibm.com/support/fixcentral/</em></a></p>"}],"value":"Customers with the products below should install FW1110.31(1110_134), FW1120.01(1120_167), or newer to remediate this vulnerability.\nPower 11\n\n  *  IBM Power System E1180 (9080-HEU)\n\n\nCustomers with the products below should install FW1110.31(1110_155), FW1120.01(1120_190), or newer to remediate this vulnerability.\nPower 11\n\n  *  IBM Power System S1122 (9824-22A)\n  *  IBM Power System S1124 (9824-42A)\n  *  IBM Power System S1122s (9824-22B)\n  *  IBM Power System S1114 (9824-41B)\n  *  IBM Power System L1122 (9856-22H)\n  *  IBM Power System L1124 (9856-42H)\n  *  IBM Power System E1150 (9043-MRU)\n\n\nCustomers with the products below should install FW1120.01(1120_190), or newer to remediate this vulnerability.\n\n\n\nPower 11\n\n  *  IBM Power System S1112 (9242-21B, 9242-21T)\n\n\n\nCustomers with the products below should install FW1060.81(1060_184), or newer to remediate this vulnerability.\nPower 10\n\n  *  IBM Power System E1080 (9080-HEX)\n\n\nCustomers with the products below should install  FW1060.81(1060_191), or newer to remediate this vulnerability.\nPower 10\n\n  *  IBM Power System S1022 (9105-22A)\n  *  IBM Power System S1024 (9105-42A)\n  *  IBM Power System S1022s (9105-22B)\n  *  IBM Power System S1014 (9105-41B)\n  *  IBM Power System L1022 (9786-22H)\n  *  IBM Power System L1024 (9786-42H)\n  *  IBM Power System E1050 (9043-MRX)\n  *  IBM Power System S1012 (9028-21B)\n\n\n\n\n\n\nCustomers with the products below should install FW950.H3(950_230) or newer to remediate this vulnerability.\nPower 9\n\n  *  IBM Power System S922 (9009-22G)\n  *  IBM Power System H922 (9223-22S)\n  *  IBM Power System S914 (9009-41G)\n  *  IBM Power System S924 (9009-42G)\n  *  IBM Power System H924 (9223-42S)\n  *  IBM Power System E950 (9040-MR9)\n  *  IBM Power System E980 (9080-M9S)\n\n\nThe images mentioned above can be located at IBM Fix Central :  https://www.ibm.com/support/fixcentral/ https://www.ibm.com/support/fixcentral/"}],"title":"Power System Integer Overflow"}},"cveMetadata":{"assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","assignerShortName":"ibm","cveId":"CVE-2026-16661","datePublished":"2026-08-19T19:31:30.150Z","dateReserved":"2026-07-22T19:47:20.654Z","dateUpdated":"2026-08-22T03:55:52.286Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-19 20:17:01","lastModifiedDate":"2026-08-22 04:17:13","problem_types":["CWE-190","CWE-190 CWE-190 Integer Overflow or Wraparound"],"metrics":{"cvssMetricV31":[{"source":"psirt@us.ibm.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","baseScore":8.2,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.5,"impactScore":6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-21T00:00:00+00:00","id":"CVE-2026-16661","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"16661","Ordinal":"1","Title":"Power System Integer Overflow","CVE":"CVE-2026-16661","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"16661","Ordinal":"1","NoteData":"IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can exploit this vulnerability, allowing arbitrary code to be executed in the host firmware runtime, giving full control over the managed system, resulting in a confidentiality, integrity, and availability impact to the managed system.","Type":"Description","Title":"Power System Integer Overflow"}]}}}