A vulnerability has been discovered in Microsoft Windows, which can be exploited by malicious, local users to gain escalated privileges.
The vulnerability is caused due to a use-after-free error in win32k.sys within NtUserCheckAccessForIntegrityLevel() as a reference counter to an object is incorrectly decremented twice when a call to LockProcessByClientId() fails.
Successful exploitation may allow execution of arbitrary code with kernel privileges.
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Subject: Microsoft Windows NtUserCheckAccessForIntegrityLevel Use-After-Free
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