Windows TDI Translation Driver (tdx.sys) Elevation of Privilege Vulnerability
CVE-2026-27921 is a local elevation-of-privilege vulnerability in the Windows TDI Translation Driver, tdx.sys. The provided content describes the issue as a race condition caused by concurrent execution using a shared resource with improper synchronization. Additional mention context characterizes CVE-2026-27921 as one of two separate use-after-free flaws in tdx.sys that can lead to privilege escalation. Based on the supplied material, exploitation occurs locally by an authorized attacker and can result in elevation to SYSTEM privileges.
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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
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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
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.
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.