{"id":"CVE-2026-79607","state":"PUBLISHED","title":"Xenstore: Guests can crash xenstored during Live Update","description":"During Xenstore live update the state record for a Xenstore watch with\nspecified watch depth is written with two bytes missing.  This results\nin an inconsistent state when reading the state back in the new Xenstore,\ncausing a crash of Xenstore or wrong Xenstore data.","publishedAt":"2026-10-13T15:43:43.425Z","updatedAt":"2026-10-16T18:36:50.515Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"XEN","products":["Xen Xen"],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-514","status":"unknown"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-514.html","http://xenbits.xen.org/xsa/advisory-514.html","http://www.openwall.com/lists/oss-security/2026/10/13/3"],"weaknesses":["CWE-119"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/79xxx/CVE-2026-79607.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-79607","state":"PUBLISHED","datePublished":"2026-10-13T15:43:43.425Z","dateUpdated":"2026-10-16T18:36:50.515Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2026-08-25T07:35:05.289Z"},"containers":{"cna":{"title":"Xenstore: Guests can crash xenstored during Live Update","descriptions":[{"lang":"en","value":"During Xenstore live update the state record for a Xenstore watch with\nspecified watch depth is written with two bytes missing.  This results\nin an inconsistent state when reading the state back in the new Xenstore,\ncausing a crash of Xenstore or wrong Xenstore data."}],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-514","status":"unknown"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-514.html"}],"providerMetadata":{"shortName":"XEN","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateUpdated":"2026-10-13T15:43:43.425Z"},"datePublic":"2026-10-13T12:00:00.000Z","impacts":[{"descriptions":[{"lang":"en","value":"An unprivileged guest can cause the Xenstore service to crash or to get\ncorrupted during a live update of Xenstore, causing a DoS of the host\nregarding further domain administration actions."}]}],"configurations":[{"lang":"en","value":"Only systems running Xen 4.22 are vulnerable.  Systems running Xen 4.21\nor older are not vulnerable.\n\nOnly systems running C xenstore either as daemon or as stubdom are\nvulnerable. Systems running oxenstored are not vulnerable."}],"workarounds":[{"lang":"en","value":"Not doing a live update of Xenstore avoids the vulnerability.\n\nSwitching to oxenstored avoids the vulnerability."}],"credits":[{"lang":"en","type":"finder","value":"This issue was discovered by Andrii Sultanov of Vates."}]},"adp":[{"title":"CVE Program Container","references":[{"url":"http://xenbits.xen.org/xsa/advisory-514.html"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/13/3"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-10-13T16:13:38.746Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-15T18:01:08.421555Z","id":"CVE-2026-79607","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"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":"2026-10-16T18:36:50.515Z"}}]}}}