{"id":"CVE-2026-62426","state":"PUBLISHED","title":"sysctl and platform-op locks open to abuse","description":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo manage the system, sysctl and platform operations are used by the\ncontrol domain or a possible Xenstore domain.  Some of these operations\nmay not be executed in parallel, so a system-wide lock each is used.\nThe way those locks are acquired is, however, not providing any fairness.\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.\n\nThe sysctl issue is CVE-2026-62426.\n\nThe platform-op issue is CVE-2026-62427.","publishedAt":"2026-07-28T12:31:57.586Z","updatedAt":"2026-07-28T15:55:11.598Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"XEN","products":["Xen Xen"],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-499","status":"unknown"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-499.html"],"weaknesses":["CWE-667","CWE-412"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62426.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62426","state":"PUBLISHED","datePublished":"2026-07-28T12:31:57.586Z","dateUpdated":"2026-07-28T15:55:11.598Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2026-07-14T10:28:12.655Z"},"containers":{"cna":{"title":"sysctl and platform-op locks open to abuse","descriptions":[{"lang":"en","value":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo manage the system, sysctl and platform operations are used by the\ncontrol domain or a possible Xenstore domain.  Some of these operations\nmay not be executed in parallel, so a system-wide lock each is used.\nThe way those locks are acquired is, however, not providing any fairness.\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.\n\nThe sysctl issue is CVE-2026-62426.\n\nThe platform-op issue is CVE-2026-62427."}],"affected":[{"vendor":"Xen","product":"Xen","defaultStatus":"unknown","versions":[{"version":"consult Xen advisory XSA-499","status":"unknown"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-499.html"}],"providerMetadata":{"shortName":"XEN","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateUpdated":"2026-07-28T12:31:57.586Z"},"datePublic":"2026-07-28T12:00:00.000Z","impacts":[{"descriptions":[{"lang":"en","value":"A less privileged entity may stall an equally or more privileged entity,\npotentially leading to a Denial od Service (DoS) of up to the entire\nhost."}]}],"configurations":[{"lang":"en","value":"All Xen versions from 4.0 onwards are vulnerable.  Earlier versions use\na different locking operation, but may also be vulnerable."}],"workarounds":[{"lang":"en","value":"There is no known mitigation."}],"credits":[{"lang":"en","type":"finder","value":"This issue was discovered by Jan Beulich of SUSE."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":8.8,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T15:55:06.523957Z","id":"CVE-2026-62426","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-667","type":"CWE","lang":"en","description":"CWE-667 Improper Locking"}]},{"descriptions":[{"cweId":"CWE-412","type":"CWE","lang":"en","description":"CWE-412 Unrestricted Externally Accessible Lock"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-28T15:55:11.598Z"}}]}}}