Vulnerability · Published Sep 14, 2026 · Assigned by microsoft
CVE-2026-85921Windows Secure Kernel Mode Elevation of Privilege Vulnerability
High 8.2
In plain English
A high-severity double free in Windows 11 version 26H1 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).
Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.3%top 71.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – before 10.0.28000.2956 |
Weakness: CWE-415 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Windows Secure Kernel Mode Elevation of Privilege Vulnerability vendor-advisory, patch