{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-79602", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "state": "PUBLISHED", "assignerShortName": "XEN", "dateReserved": "2026-08-25T07:35:05.289Z", "datePublished": "2026-09-08T12:11:08.534Z", "dateUpdated": "2026-09-08T13:08:03.763Z"}, "containers": {"cna": {"title": "x86: improper handling of HVM emulation return codes", "datePublic": "2026-09-08T12:00:00.000Z", "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."}], "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."}]}], "affected": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-510"}]}], "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 Monn\u00e9 of AMD."}], "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-510.html"}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2026-09-08T12:11:08.534Z"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://xenbits.xen.org/xsa/advisory-510.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-09-08T13:08:03.763Z"}}]}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-510"}]}], "source": "security@xen.org"}], "cveTags": [], "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."}], "id": "CVE-2026-79602", "lastModified": "2026-09-08T13:17:27.157", "metrics": {}, "published": "2026-09-08T13:17:27.157", "references": [{"source": "security@xen.org", "url": "https://xenbits.xenproject.org/xsa/advisory-510.html"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Received"}

{}

{}