{"id":"CVE-2026-62433","state":"PUBLISHED","title":"correct buffer checks for DM_OP hypercalls","description":"Parts of the DM_OP handling code assumes the caller has provided the\nrequired number of buffers for the given operation without any checking\nbeing done.  As a result, certain operations might access stack\nrubble as structures are possibly uninitialized.","publishedAt":"2026-07-28T12:32:59.802Z","updatedAt":"2026-07-28T16:33:33.573Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","source":"CISA-ADP"},"assigner":"XEN","products":["Xen Xen"],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-506","status":"unknown"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-506.html","http://xenbits.xen.org/xsa/advisory-506.html","http://www.openwall.com/lists/oss-security/2026/07/28/22"],"weaknesses":["CWE-665"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62433.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62433","state":"PUBLISHED","datePublished":"2026-07-28T12:32:59.802Z","dateUpdated":"2026-07-28T16:33:33.573Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2026-07-14T10:28:12.655Z"},"containers":{"cna":{"title":"correct buffer checks for DM_OP hypercalls","descriptions":[{"lang":"en","value":"Parts of the DM_OP handling code assumes the caller has provided the\nrequired number of buffers for the given operation without any checking\nbeing done.  As a result, certain operations might access stack\nrubble as structures are possibly uninitialized."}],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-506","status":"unknown"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-506.html"}],"providerMetadata":{"shortName":"XEN","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateUpdated":"2026-07-28T12:32:59.802Z"},"datePublic":"2026-07-28T12:00:00.000Z","impacts":[{"descriptions":[{"lang":"en","value":"A device model of a HVM guest can gain insight on the contents of the\nXen stack, thus possibly leaking data from other guests contexts."}]}],"configurations":[{"lang":"en","value":"All Xen versions from 4.10 onwards are vulnerable.  Xen versions 4.9 and\nearlier are not vulnerable.\n\nOnly entities controlling HVM guests can leverage the vulnerability.\nThese are device models running in either a stub domain or de-privileged\nin Dom0."}],"workarounds":[{"lang":"en","value":"Running only PV or PVH guests will avoid the vulnerability.\n\n(Switching from a device model stub domain or a de-privileged device\nmodel to a fully privileged Dom0 device model does NOT mitigate this\nvulnerability.  Rather, it simply recategorises the vulnerability to\nhostile management code, regarding it \"as designed\"; thus it merely\nreclassifies these issues as \"not a bug\".  The security of a Xen system\nusing stub domains is still better than with a qemu-dm running as a Dom0\nprocess.  Users and vendors of stub qemu dm systems should not change\ntheir configuration to use a Dom0 QEMU process.)"}]},"adp":[{"title":"CVE Program Container","references":[{"url":"http://xenbits.xen.org/xsa/advisory-506.html"},{"url":"http://www.openwall.com/lists/oss-security/2026/07/28/22"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-28T16:33:33.573Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.3,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T15:03:57.527525Z","id":"CVE-2026-62433","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-665","type":"CWE","lang":"en","description":"CWE-665 Improper Initialization"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-28T15:06:29.391Z"}}]}}}