Affects Microsoft Windows Hyper-V, a widely used enterprise virtualization platform; local privilege escalation can lead to host compromise and tenant escape.
CVE-2026-85369
Local privilege escalation in Windows Hyper-V via out-of-bounds read.
Is CVE-2026-85369 being exploited?
Not confirmed. CVE-2026-85369 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-85369?
CVE-2026-85369 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-85369?
Yes. A fix has been recorded for CVE-2026-85369. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-85369 affect?
CVE-2026-85369 affects Microsoft Windows Hyper-V, Windows Server (Hyper-V role), Windows 10/11 Hyper-V. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-85369?
Apply Microsoft Hyper-V security update immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated local attacker can exploit an OOB read to elevate privileges on Hyper-V host, enabling guest escape or code execution at higher privileges.
Patch when possible
- affected>= 10.0.19044.0 and < 10.0.19044.7807
- affected>= 10.0.19045.0 and < 10.0.19044.7807
- affected>= 10.0.22631.0 and < 10.0.22631.7652
- affected>= 10.0.22631.0 and < 10.0.22631.7652
- affected>= 10.0.26100.0 and < 10.0.26100.9711
- affected>= 10.0.26200.0 and < 10.0.26200.9711
- affected>= 10.0.28000.0 and < 10.0.28000.3231
- affected>= 10.0.26300.0 and < 10.0.26300.9711
- affected>= 10.0.20348.0 and < 10.0.20348.5761
- affected>= 10.0.26100.0 and < 10.0.26100.33650
- affected>= 10.0.26100.0 and < 10.0.26100.33650
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.