High

Windows TDI Translation Driver (tdx.sys) Elevation of Privilege Vulnerability

IdentifiersCVE-2026-27908CWE-416· Use After Free

CVE-2026-27908 is an Important local elevation-of-privilege vulnerability in the Windows TDI Translation Driver (tdx.sys). The flaw is a use-after-free condition in tdx.sys, classified as CWE-416. Microsoft states that an authorized attacker can exploit the issue locally to elevate privileges. Available reporting indicates exploitation requires winning a race condition, which is reflected in the High attack complexity. The vulnerability affects the Windows kernel networking component tdx.sys and can result in escalation from a low-privileged local context to SYSTEM.

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ANALYST BRIEF

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.

Successful exploitation allows a local authorized attacker with low privileges to elevate to SYSTEM privileges. Because the resulting security context is SYSTEM, the practical impact includes full compromise of the affected host, including the ability to access sensitive data, modify system state, install or execute arbitrary code in a highly privileged context, disable protections, and disrupt system availability. Supporting CVSS metrics indicate high impact to confidentiality, integrity, and availability.

Mitigation

If you can’t patch tonight, do this now.

No specific vendor mitigation beyond patching is provided in the supplied content. In the absence of a patch, reduce exposure by limiting local access to trusted users only, minimizing the presence of low-privileged accounts on affected systems, enforcing least privilege, and monitoring for suspicious local privilege-escalation activity. Because exploitation is local and requires an authorized attacker, hardening post-compromise pathways and restricting interactive/logon access can reduce risk, but these measures do not remediate the underlying flaw.

Remediation

Patch, then assume compromise.

Apply Microsoft's official security update for CVE-2026-27908. Microsoft lists an official fix as available as part of the April 2026 Patch Tuesday security updates. Standard remediation is to deploy the relevant Windows security update to affected systems and verify that the patched version of tdx.sys is installed.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

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.

VendorProductType

Microsoft CorporationWindowsoperating_system

Microsoft CorporationWindows 10 1607operating_system

Microsoft CorporationWindows 10 1809operating_system

Microsoft CorporationWindows 10 21h2operating_system

Microsoft CorporationWindows 10 22h2operating_system

Microsoft CorporationWindows 11 23h2operating_system

Microsoft CorporationWindows 11 24h2operating_system

Microsoft CorporationWindows 11 25h2operating_system

Microsoft CorporationWindows 11 26h1operating_system

Microsoft CorporationWindows Server 2012operating_system

Microsoft CorporationWindows Server 2012 R2operating_system

Microsoft CorporationWindows Server 2016operating_system

Microsoft CorporationWindows Server 2019operating_system

Microsoft CorporationWindows Server 2022operating_system

Microsoft CorporationWindows Server 2022 23h2operating_system

Microsoft CorporationWindows Server 2025operating_system

Microsoft CorporationWindows Server 23h2operating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

3 SOURCESView more in app

cyberthroneNews

Apr 15, 2026

Microsoft Patch Tuesday - April 2026 - TheCyberThrone

An elevation-of-privilege vulnerability in the Windows TDI Translation Driver (tdx.sys) caused by a use-after-free flaw.

talos intelligence blogNews

Apr 14, 2026

Microsoft Patch Tuesday for April 2026 - Snort Rule and Prominent Vulnerabilities

A Windows TDI Translation Driver (tdx.sys) elevation of privilege vulnerability.

msrc microsoftNews

Apr 14, 2026

CVE-2026-27908 - Security Update Guide - Microsoft - Windows TDI Translation Driver (tdx.sys) Elevation of Privilege Vulnerability

A local elevation of privilege vulnerability in the Windows TDI Translation Driver (tdx.sys) caused by a use-after-free condition. Successful exploitation can allow an authorized attacker to gain SYSTEM privileges.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures1

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-27908

NVD

nvd.nist.gov/vuln/detail/CVE-2026-27908

MITRE CWE · CWE-416

Use After Free

Vendor Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27908