CVE-2026-42488

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42488", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "state": "PUBLISHED", "assignerShortName": "XEN", "dateReserved": "2026-04-27T14:20:24.138Z", "datePublished": "2026-06-18T13:47:23.838Z", "dateUpdated": "2026-06-18T15:07:35.190Z"}, "containers": {"cna": {"title": "x86: mismatched mapcache metadata", "datePublic": "2026-06-09T12:00:00.000Z", "descriptions": [{"lang": "en", "value": "Some shadow paging errors paths will switch the page-tables without\nupdating the currently running vCPU reference. This causes a mismatch\nbetween the loaded page-tables and the mapcache metadata which can lead\nto corruption of the mapcache."}], "impacts": [{"descriptions": [{"lang": "en", "value": "Privilege escalation, Denial of Service (DoS) affecting the entire host,\nand information leaks."}]}], "affected": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-494"}]}], "configurations": [{"lang": "en", "value": "Xen 4.15 and onwards are vulnerable. Any Xen version with the fix for\nXSA-438 applied is vulnerable.\n\nOnly x86 systems are vulnerable. Only 64-bit PV guests can leverage the\nvulnerability, and only when running in shadow mode. Shadow mode would\nbe in use when migrating guests or as a workaround for XSA-273 (L1TF)."}], "workarounds": [{"lang": "en", "value": "Running only HVM or PVH guests will avoid the vulnerability.\n\nRunning PV guests in the PV shim will also avoid the vulnerability."}], "credits": [{"lang": "en", "type": "finder", "value": "This issue was discovered by Roger Pau Monn\u00e9 of XenServer."}], "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-494.html"}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2026-06-18T13:47:23.838Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-119", "lang": "en", "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-06-18T15:02:17.385668Z", "id": "CVE-2026-42488", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-18T15:03:20.373Z"}}, {"title": "CVE Program Container", "references": [{"url": "http://xenbits.xen.org/xsa/advisory-494.html"}, {"url": "http://www.openwall.com/lists/oss-security/2026/06/09/14"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-06-18T15:07:35.190Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "http://xenbits.xen.org/xsa/advisory-494.html"}, {"url": "http://www.openwall.com/lists/oss-security/2026/06/09/14"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-06-18T15:07:35.190Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-42488", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-06-18T15:02:17.385668Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-119", "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-18T15:01:34.153Z"}}], "cna": {"title": "x86: mismatched mapcache metadata", "credits": [{"lang": "en", "type": "finder", "value": "This issue was discovered by Roger Pau Monn\u00e9 of XenServer."}], "impacts": [{"descriptions": [{"lang": "en", "value": "Privilege escalation, Denial of Service (DoS) affecting the entire host,\nand information leaks."}]}], "affected": [{"vendor": "Xen", "product": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-494"}], "defaultStatus": "unknown"}], "datePublic": "2026-06-09T12:00:00.000Z", "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-494.html"}], "workarounds": [{"lang": "en", "value": "Running only HVM or PVH guests will avoid the vulnerability.\n\nRunning PV guests in the PV shim will also avoid the vulnerability."}], "descriptions": [{"lang": "en", "value": "Some shadow paging errors paths will switch the page-tables without\nupdating the currently running vCPU reference. This causes a mismatch\nbetween the loaded page-tables and the mapcache metadata which can lead\nto corruption of the mapcache."}], "configurations": [{"lang": "en", "value": "Xen 4.15 and onwards are vulnerable. Any Xen version with the fix for\nXSA-438 applied is vulnerable.\n\nOnly x86 systems are vulnerable. Only 64-bit PV guests can leverage the\nvulnerability, and only when running in shadow mode. Shadow mode would\nbe in use when migrating guests or as a workaround for XSA-273 (L1TF)."}], "providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2026-06-18T13:47:23.838Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42488", "state": "PUBLISHED", "dateUpdated": "2026-06-18T15:07:35.190Z", "dateReserved": "2026-04-27T14:20:24.138Z", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "datePublished": "2026-06-18T13:47:23.838Z", "assignerShortName": "XEN"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "product": "Xen", "vendor": "Xen", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-494"}]}], "source": "security@xen.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Some shadow paging errors paths will switch the page-tables without\nupdating the currently running vCPU reference. This causes a mismatch\nbetween the loaded page-tables and the mapcache metadata which can lead\nto corruption of the mapcache."}], "id": "CVE-2026-42488", "lastModified": "2026-06-22T18:38:02.507", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42488", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-18T15:02:17.385668Z", "version": "2.0.3"}}]}, "published": "2026-06-18T14:17:25.410", "references": [{"source": "security@xen.org", "url": "https://xenbits.xenproject.org/xsa/advisory-494.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/06/09/14"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://xenbits.xen.org/xsa/advisory-494.html"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "consult Xen advisory XSA-494"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Xen", "source": "cna", "vendor": "Xen"}, "product": "xen", "vendor": "xen"}], "created": "2026-06-18T18:30:15.139915+00:00", "updated": "2026-06-18T21:30:16.008119+00:00", "vendors": ["xen", "xen$PRODUCT$xen"]}