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CVE-2026-21245 is a heap-based buffer overflow in the Windows Kernel that allows a local, authorized attacker to elevate privileges. The flaw is classified as an elevation-of-privilege issue in the kernel and arises from improper handling of memory on the heap, enabling out-of-bounds overwrite conditions in kernel context. Successful exploitation can allow an attacker who already has local access and valid credentials to execute actions with higher privileges than intended.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A privilege escalation vulnerability affecting the Windows Kernel.
An elevation of privilege vulnerability in Windows Kernel (no additional details provided in the content).
An elevation of privilege vulnerability in the Windows Kernel.
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.