Win32k Elevation of Privilege Vulnerability in Windows Win32K - ICOMP
CVE-2026-33840 is a Microsoft Windows Win32k elevation-of-privilege vulnerability affecting the Win32K - ICOMP component. The flaw is a use-after-free condition (CWE-416) in which memory is accessed after it has been freed, creating a condition that can be leveraged by a local attacker with low privileges to corrupt kernel memory and elevate execution context. Microsoft classifies the issue as Important and indicates that successful exploitation can result in SYSTEM-level privileges. The available information identifies the affected area as Win32K - ICOMP, but does not provide function-level or code-path specifics.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An important Win32k elevation of privilege vulnerability that Microsoft determined is more likely to be exploited.
A Microsoft Windows Win32K use-after-free elevation of privilege vulnerability that allows a locally authorized attacker with low privileges to gain SYSTEM privileges.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.