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PatchSiren cyber security CVE debrief

CVE-2026-50396 Microsoft CVE debrief

CVE-2026-50396 is a high-severity vulnerability in Windows Kernel-Mode Drivers. An authorized attacker can exploit this use-after-free vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. Microsoft has released a patch for this vulnerability. System administrators and users of Windows 11 and Windows Server 2025 should be aware of this vulnerability and apply the patch as soon as possible. The vulnerability is a use-after-free issue in Windows Kernel-Mode Drivers, which can be exploited by an authorized attacker to elevate privileges locally.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

System administrators and users of Windows 11 and Windows Server 2025 should be aware of this vulnerability and apply the patch as soon as possible. The vulnerability can be exploited by an authorized attacker to elevate privileges locally, which can have a significant impact on the security of the system.

Technical summary

The vulnerability is a use-after-free issue in Windows Kernel-Mode Drivers. An authorized attacker can exploit this vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. The affected products are Windows 11 and Windows Server 2025. Microsoft has released a patch for this vulnerability.

Defensive priority

High

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure that all Windows 11 and Windows Server 2025 systems are updated with the latest security patches
  • Monitor system logs for suspicious activity
  • Implement additional security measures such as least privilege access and network segmentation
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record was published on 2026-07-14T18:17:41.727Z and last modified on 2026-07-21T11:57:18.230Z. The NVD entry is currently Analyzed. The vulnerability is a use-after-free issue in Windows Kernel-Mode Drivers. Microsoft has released a patch for this vulnerability. However, the source detail is limited, and defenders should verify the affected scope and apply the patch as soon as possible.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T18:17:41.727Z and has not been modified since then. The NVD entry is currently Analyzed.