{"id":"CVE-2026-101309","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-101309","generatedAt":"2026-10-28T01:47:18.858Z","title":"This race condition could be triggered by a guest running malicious, privileged code.","description":"The xHCI (USB 3) device model did not validate or save the event ring size provided by the guest.  The size was re-read from guest memory on each use, and Transfer Request Block (TRB) fields were loaded without protection against concurrent modification by the guest.  This race condition could be triggered by a guest running malicious, privileged code.\n\nA malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve's Capsicum sandbox.","published":"2026-10-15T08:16:36.000Z","lastModified":"2026-10-16T04:18:06.000Z","status":"Awaiting Analysis","sourceIdentifier":"secteam@freebsd.org","cvss":{"version":"3.1","score":7,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-362"],"affected":[],"epss":{"score":0.00117,"percentile":0.01669,"date":"2026-10-26","history":[{"date":"2026-10-15","score":0.00181,"percentile":0.07121}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-15T18:30:14.000Z","detail":{"from":null,"score":"7.0","severity":"HIGH","fromSeverity":null},"summary":"Now scored CVSS 7.0 HIGH."},{"kind":"new","label":"New CVE","at":"2026-10-15T08:16:36.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-10-15T08:16:36.197Z"},"summary":"New CVE, high severity (CVSS 7.0)."}],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:72.bhyve.asc","source":"secteam@freebsd.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-101309","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}