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CVE-2026-27921 is a local elevation-of-privilege vulnerability in the Windows TDI Translation Driver. The issue is described as concurrent execution using a shared resource with improper synchronization, resulting in a race condition. Additional reporting associates this vulnerability with a use-after-free condition in tdx.sys. A local authorized attacker can exploit the flaw to elevate privileges to SYSTEM on a vulnerable Windows system.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An elevation-of-privilege vulnerability in the Windows TDI Translation Driver (tdx.sys) caused by a use-after-free flaw.
A Windows TDI Translation Driver (tdx.sys) elevation of privilege vulnerability.
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.