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CVE-2026-34333 is a local elevation-of-privilege vulnerability in the Windows Win32K-GRFX subsystem, a kernel-mode graphics component involved in GDI rendering and window-management operations. The flaw is described as a use-after-free condition in Win32K-GRFX, with associated integer overflow or wraparound behavior also identified as part of the bug pattern. The issue can result in premature release of a kernel graphics object followed by subsequent access through a stale pointer. An attacker may be able to reclaim the freed memory with controlled data and leverage the corrupted object state to manipulate kernel memory, corrupt kernel structures, or redirect execution flow. Because the vulnerable component executes in kernel mode, successful exploitation can transition a low-privileged local user to SYSTEM-level privileges.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Win32K-GRFX local elevation of privilege vulnerability caused by a use-after-free, with integer overflow/wraparound also referenced. Successful exploitation could allow an authorized attacker with low privileges to gain SYSTEM privileges.
A Win32k elevation of privilege vulnerability mentioned as another flaw patched in the same Microsoft update cycle.
A local privilege escalation vulnerability in the Windows Win32K GRFX kernel-mode graphics subsystem caused by an integer overflow leading to a use-after-free, allowing a low-privileged local attacker to gain SYSTEM privileges.
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.