{"id":"CVE-2026-62434","state":"PUBLISHED","title":"PoD: Don't try to reclaim special pages","description":"A guest started with Populated on Demand enabled (PoD) can attempt to\nreclaim pages which aren't regular guest RAM.  This can cause corruption\nof memory management state in Xen.","publishedAt":"2026-07-28T12:33:08.540Z","updatedAt":"2026-07-28T16:33:34.668Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"CISA-ADP"},"assigner":"XEN","products":["Xen Xen"],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-507","status":"unknown"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-507.html","http://xenbits.xen.org/xsa/advisory-507.html","http://www.openwall.com/lists/oss-security/2026/07/28/23"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62434.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62434","state":"PUBLISHED","datePublished":"2026-07-28T12:33:08.540Z","dateUpdated":"2026-07-28T16:33:34.668Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2026-07-14T10:28:12.655Z"},"containers":{"cna":{"title":"PoD: Don't try to reclaim special pages","descriptions":[{"lang":"en","value":"A guest started with Populated on Demand enabled (PoD) can attempt to\nreclaim pages which aren't regular guest RAM.  This can cause corruption\nof memory management state in Xen."}],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-507","status":"unknown"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-507.html"}],"providerMetadata":{"shortName":"XEN","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateUpdated":"2026-07-28T12:33:08.540Z"},"datePublic":"2026-07-28T12:00:00.000Z","impacts":[{"descriptions":[{"lang":"en","value":"A buggy or malicious guest can cause corruption of Xen's state, leading\nto crashes or other malfunctions.  Information leak and privilege\nescalation cannot be ruled out."}]}],"configurations":[{"lang":"en","value":"All Xen versions from 3.4 onwards are vulnerable.  Xen versions 3.3 and\nearlier are not vulnerable.\n\nOnly x86 systems are vulnerable.\n\nOnly x86 HVM and PVH guests started in populate-on-demand mode are\nbelieved to be able to leverage the vulnerability.  Populate-on-demand\nmode is activated when the guest's xl configuration file specifies a\n\"maxmem\" value which is larger than the \"memory\" value."}],"workarounds":[{"lang":"en","value":"Running only PV guests or HVM/PVH guests without PoD will avoid the\nvulnerability."}]},"adp":[{"title":"CVE Program Container","references":[{"url":"http://xenbits.xen.org/xsa/advisory-507.html"},{"url":"http://www.openwall.com/lists/oss-security/2026/07/28/23"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-28T16:33:34.668Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T14:59:52.970334Z","id":"CVE-2026-62434","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","type":"CWE","lang":"en","description":"CWE-787 Out-of-bounds Write"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-28T15:00:00.728Z"}}]}}}