{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23557","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","state":"PUBLISHED","assignerShortName":"XEN","dateReserved":"2026-01-14T13:07:36.961Z","datePublished":"2026-05-19T12:49:42.202Z","dateUpdated":"2026-05-19T14:42:45.464Z"},"containers":{"cna":{"title":"Xenstored DoS via XS_RESET_WATCHES command","datePublic":"2026-04-28T12:00:00.000Z","descriptions":[{"lang":"en","value":"Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES\ncommand within a transaction due to an assert() triggering.\n\nIn case xenstored was built with NDEBUG #defined nothing bad will\nhappen, as assert() is doing nothing in this case. Note that the\ndefault is not to define NDEBUG for xenstored builds even in release\nbuilds of Xen."}],"impacts":[{"descriptions":[{"lang":"en","value":"Any unprivileged domain can cause xenstored to crash, causing a\nDoS (denial of service) for any Xenstore action. This will result\nin an inability to perform further domain administration on the host."}]}],"affected":[{"defaultStatus":"unknown","product":"Xen","vendor":"Xen","versions":[{"status":"unknown","version":"consult Xen advisory XSA-484"}]}],"configurations":[{"lang":"en","value":"All Xen systems from Xen 4.2 onwards are vulnerable. Systems up to\nXen 4.1 are not vulnerable.\n\nSystems using the C variant of xenstored or xenstore-stubdom built\nwithout NDEBUG are vulnerable. Systems using the OCaml variant of\nXenstore (oxenstored), or the C variant (xenstored or xenstore-stubdom)\nbuilt with NDEBUG defined are not vulnerable."}],"workarounds":[{"lang":"en","value":"There is no known mitigation available."}],"credits":[{"lang":"en","type":"finder","value":"This issue was discovered by Andrii Sultanov of Vates."}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-484.html"}],"providerMetadata":{"orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","shortName":"XEN","dateUpdated":"2026-05-19T12:49:42.202Z"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/04/28/11"},{"url":"http://xenbits.xen.org/xsa/advisory-484.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-05-19T13:06:41.611Z"}},{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-617","lang":"en","description":"CWE-617 Reachable Assertion"}]}],"metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":6.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-19T14:42:12.994792Z","id":"CVE-2026-23557","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-19T14:42:45.464Z"}}]}}