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CVE-2018-8589 is a local elevation of privilege vulnerability in the Windows kernel-mode graphics component win32k.sys affecting Windows 7, Windows Server 2008, and Windows Server 2008 R2. The flaw is a race condition in win32k!xxxMoveWindow caused by improper locking of messages sent synchronously between threads. Exploitation involves creating two threads with windows that share a window procedure and recursively triggering WM_NCCALCSIZE handling so that termination of the opposite thread at maximum recursion depth causes asynchronous copying of an attacker-controlled lParam structure. The vulnerable interaction between win32k!xxxCalcValidRects and win32k!SfnINOUTNCCALCSIZE allows attacker-controlled data to be copied into kernel context, leading to execution flow redirection and privilege escalation.
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No public exploit code observed for this vulnerability.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously discovered zero-day vulnerability referenced only as background among prior Windows local privilege escalation cases.
A zero-day privilege escalation vulnerability in Microsoft Windows win32k.sys caused by a race condition in win32k!xxxMoveWindow due to improper locking of synchronously sent messages between threads.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.