CVE-2026-34331
Status: AnalyzedHigh (7)—
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Base score: 7
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.20%
- Percentile among all scored CVEs: 9
- Score date: 10/4/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
🎯 ATT&CK techniques
How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
- Exploitation
T1068Exploitation for Privilege Escalationprivilege escalation95 % - Secondary impact
T1059Command and Scripting Interpreterexecution75 %
Acceso local (AV:L) sin interacción de usuario (UI:N) con componente privilegiado (Win32K). CWE-362 (race condition) permite escalada de privilegios, resultando en ejecución de código con permisos elevados.
Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.
🛡️ ATT&CK mitigations that cover these techniques
Affected technologies (14)
Microsoft — Windows 10 1607Microsoft — Windows 10 1809Microsoft — Windows 10 21h2Microsoft — Windows 10 22h2Microsoft — Windows 11 23h2Microsoft — Windows 11 24h2Microsoft — Windows 11 25h2Microsoft — Windows 11 26h1Microsoft — Windows Server 2012Microsoft — Windows Server 2016Microsoft — Windows Server 2019Microsoft — Windows Server 2022Microsoft — Windows Server 2022 23h2Microsoft — Windows Server 2025
CWEs
- CWE-362, CWE-416
References
Raw JSON (NVD)
Show
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