Windows Kernel Elevation of Privilege Race Condition
CVE-2026-21231 is an elevation of privilege vulnerability in the Windows Kernel caused by concurrent execution using a shared resource with improper synchronization, i.e., a race condition. Microsoft and related reporting describe the flaw as affecting the Windows Kernel and allowing a locally authorized attacker to elevate privileges. The issue is rated Important with CVSS 7.8 and was assessed as 'Exploitation More Likely' in February 2026 Patch Tuesday reporting. Specific vulnerable functions or code paths were not provided in the available content.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
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
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows Kernel race condition elevation of privilege vulnerability rated more likely to be exploited, in a component with frequent patching history.
A privilege escalation vulnerability affecting the Windows Kernel.
A Windows kernel vulnerability with an 'Exploitation More Likely' rating per the content.
A scope-changed vulnerability referenced as having expanded impact beyond the initially understood affected components; no additional technical details provided in the content.
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.