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CVE-2026-96231

Microsoft Security Advisory CVE-2026-96231 - .NET and Visual Studio Elevation of Privilege Vulnerability

Published Oct 13, 2026 · updated Oct 13, 2026

## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.NETCore.App.Runtime; System.Private.CoreLib. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Unix named-mutex and shared-memory paths can be manipulated through insecure global directories, symlink races, and unsafe permission changes, allowing local attackers to truncate or overwrite files, widen directory permissions, or elevate privileges. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/479 ## CVSS Details - **Version:** 3.1 - **Severity:** High - **Score:** 7.8 - **Vector:** - **Weakness:** CWE-59 (Improper Link Resolution Before File Access ('Link Following')) ## Affected Platforms - **Platforms:** Linux, macOS - **Architectures:** All ## Affected Packages The vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- [Microsoft.NETCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.NETCore.App.Runtime.linux-arm) | >= 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 8.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 10.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 9.0.0, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, = 11.0.0-preview.1, How do I know if I am affected? If using a package listed in [affected packages](#affected-packages), you're exposed to the vulnerability. ### How do I fix the issue? 1. To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also up

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · GitHub Advisory Database

    Detected

    ## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.NETCore.App.Runtime; System.Private.CoreLib. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Unix named-mutex and shared-memory paths can be manipulated through insecure global directories, symlink rac

  2. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-arm fixed in 8.0.32; Microsoft.NETCore.App.Runtime.linux-arm64 fixed in 8.0.32; Microsoft.NETCore.App.Runtime.linux-musl-arm fixed in 8.0.32; Microsoft.NETCore.App.Runtime.linux-musl-arm64 fixed in 8.0.32

  3. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-arm fixed in 8.0.32

  4. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-arm64 fixed in 8.0.32

  5. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-musl-arm fixed in 8.0.32

  6. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-musl-arm64 fixed in 8.0.32

  7. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-musl-x64 fixed in 8.0.32

  8. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-x64 fixed in 8.0.32

  9. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.osx-arm64 fixed in 8.0.32

  10. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.osx-x64 fixed in 8.0.32

  11. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-arm fixed in 10.0.13

  12. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-arm64 fixed in 10.0.13

  13. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-musl-arm fixed in 10.0.13

  14. Oct 13, 2026 · GitHub Advisory Database

    Fix available

    Microsoft.NETCore.App.Runtime.linux-musl-arm64 fixed in 10.0.13

  15. Oct 13, 2026 · GitHub Advisory Database

    Updated

    ## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in Microsoft.NETCore.App.Runtime; System.Private.CoreLib. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. Unix named-mutex and shared-memory paths can be manipulated through insecure global directories, symlink rac

Affected

  • NuGet Microsoft.NETCore.App.Runtime.linux-arm10.0.0 → 10.0.13
  • NuGet Microsoft.NETCore.App.Runtime.linux-arm8.0.0 → 8.0.32
  • NuGet Microsoft.NETCore.App.Runtime.linux-arm6410.0.0 → 10.0.13
  • NuGet Microsoft.NETCore.App.Runtime.linux-arm648.0.0 → 8.0.32
  • NuGet Microsoft.NETCore.App.Runtime.linux-musl-arm10.0.0 → 10.0.13
  • NuGet Microsoft.NETCore.App.Runtime.linux-musl-arm8.0.0 → 8.0.32
  • NuGet Microsoft.NETCore.App.Runtime.linux-musl-arm6410.0.0 → 10.0.13
  • NuGet Microsoft.NETCore.App.Runtime.linux-musl-arm648.0.0 → 8.0.32
  • NuGet Microsoft.NETCore.App.Runtime.linux-musl-x648.0.0 → 8.0.32
  • NuGet Microsoft.NETCore.App.Runtime.linux-x648.0.0 → 8.0.32
  • NuGet Microsoft.NETCore.App.Runtime.osx-arm648.0.0 → 8.0.32
  • NuGet Microsoft.NETCore.App.Runtime.osx-x648.0.0 → 8.0.32

Sources

  • GitHub Advisory DatabasePackage advisoryGHSA-2j93-m82w-73j2

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • OSV.devPackage advisoryGHSA-2j93-m82w-73j2

    Microsoft Security Advisory CVE-2026-96231 - .NET and Visual Studio Elevation of Privilege Vulnerability

    osv.dev

References