ZDI-26-081: Win32kfull Use-After-Free Local Privilege Escalation

TL;DR

Microsoft Windows win32kfull has a use-after-free flaw leading to local privilege escalation.

What happened

['A use-after-free vulnerability exists in Microsoft Windows win32kfull.', 'Attackers can exploit this flaw by executing low-privileged code on the system.']

Why it matters for ops

['The vulnerability arises from improper memory handling practices.', 'Successful exploitation leads to a significant security risk as attackers gain elevated privileges.']

Mitigation

• Patch the affected system with Microsoft's latest security updates.
• Implement strict user and privilege controls to limit code execution capabilities.

Action items

• Apply patches for CVE-2026-21235 immediately.
• Review logs for signs of exploitation activity.

Detection IOCs

• Unusual memory access patterns
• Unexpected process behavior

Source link

http://www.zerodayinitiative.com/advisories/ZDI-26-081/