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This security advisory details a critical vulnerability affecting Microsoft .NETCore.App.Runtime and System.Private.CoreLib components across Unix-based environments, specifically targeting Linux and macOS operating systems. The core issue stems from how Unix named-mutex and shared-memory paths are handled, leaving them prone to manipulation via insecure global directories, symlink races, and unsafe permission changes. Local attackers can exploit these weaknesses to interact with file paths improperly resolved before access, leading to file truncation, arbitrary file overwrites, unwarranted expansion of directory permissions, or complete local privilege escalation. Because applications relying on affected packages expose these shared resources, local users with low privileges can orchestrate link-following attacks to compromise system integrity. Mitigating this risk requires updating affected package references and installing the latest .NET runtime or SDK versions across all deployed environments.
DailyCVE Form:
Platform: Microsoft .NET Core
Version: 8.0, 9.0, 10.0, 11.0
Vulnerability : Elevation of Privilege
Severity: High
date: 10/13/2026
Prediction: 10/13/2026
What Undercode Say
Analysis of CVE-2026-96225 highlights standard flaws in link resolution and file handling under Unix-like file systems. Because .NET runtime components generate shared-memory and named-mutex paths inside global locations without strict atomic checks, local actors can leverage symbolic links to intercept or redirect file operations. Security analysts must inspect runtime configurations and audit shared directory permissions to ensure unprivileged accounts cannot manipulate runtime synchronization primitives.
Exploit: (Educational Purposes!)
Check installed .NET versions and package details dotnet --info Identify potential symlink race conditions in temporary or shared runtime directories find /tmp -name "dotnet" -type l Monitor file access patterns for named-mutex or shared memory objects during runtime startup strace -e trace=file dotnet ./vulnerable-app.dll
Protection: from this CVE
To protect against CVE-2026-96225, administrators and developers must update their .NET SDK and runtime environments to the patched releases (such as version 8.0.32, 9.0.21, 10.0.13, or 11.0.0-rc.2 depending on the branch). Developers should execute package updates via NuGet or command-line interfaces, and completely recompile and redeploy any self-contained applications to ensure vulnerable runtime libraries are fully replaced.
Impact:
Successful exploitation of this vulnerability allows a local attacker with low privileges to manipulate named-mutex and shared-memory paths through symlink races. This can result in arbitrary file overwrites, file truncation, unintended widening of directory permissions, and full local privilege escalation on affected Linux and macOS systems.
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Sources:
Reported By: github.com
Extra Source Hub:
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