{"id":"CVE-2026-79602","state":"PUBLISHED","title":"x86: improper handling of HVM emulation return codes","description":"A guest with a PCI device assigned that has at least a BAR on the IO port\nspace can trigger a BUG() in Xen.","publishedAt":"2026-09-08T12:11:08.534Z","updatedAt":"2026-09-10T18:08:59.554Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"XEN","products":["Xen Xen"],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-510","status":"unknown"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-510.html","http://xenbits.xen.org/xsa/advisory-510.html","http://www.openwall.com/lists/oss-security/2026/09/08/7"],"weaknesses":["CWE-119"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/79xxx/CVE-2026-79602.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-79602","state":"PUBLISHED","datePublished":"2026-09-08T12:11:08.534Z","dateUpdated":"2026-09-10T18:08:59.554Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2026-08-25T07:35:05.289Z"},"containers":{"cna":{"title":"x86: improper handling of HVM emulation return codes","descriptions":[{"lang":"en","value":"A guest with a PCI device assigned that has at least a BAR on the IO port\nspace can trigger a BUG() in Xen."}],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-510","status":"unknown"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-510.html"}],"providerMetadata":{"shortName":"XEN","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateUpdated":"2026-09-08T12:11:08.534Z"},"datePublic":"2026-09-08T12:00:00.000Z","impacts":[{"descriptions":[{"lang":"en","value":"Passing through a PCI device with at least one BAR in IO address space to\nunprivileged HVM guests can result in a Denial of Service (DoS) affecting\nthe entire host."}]}],"configurations":[{"lang":"en","value":"Xen versions 4.6 and later are vulnerable.  This is known to be the case\nwith the fix for XSA-491, but it's possible the issue can also be\ntriggered from other, non-analyzed paths.\n\nOnly x86 systems are vulnerable.  Arm systems are not vulnerable.\n\nOnly HVM guests with a PCI device with IO BARs assigned can leverage the\nvulnerability."}],"workarounds":[{"lang":"en","value":"There is no mitigation available."}],"credits":[{"lang":"en","type":"finder","value":"This issue was discovered by Jiqian Chen of AMD and diagnosed as a\nsecurity issue by Roger Pau Monné of AMD."}]},"adp":[{"title":"CVE Program Container","references":[{"url":"http://xenbits.xen.org/xsa/advisory-510.html"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/08/7"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-09-08T17:08:32.715Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":8.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-10T18:08:16.213605Z","id":"CVE-2026-79602","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-119","type":"CWE","lang":"en","description":"CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-10T18:08:59.554Z"}}]}}}