Vulnerability · CVE-2026-96231
Microsoft Security Advisory CVE-2026-96231 - .NET and Visual Studio Elevation of Privilege Vulnerability
Published Oct 13, 2026 · catalog updated Oct 13, 2026 · Microsoft Security Advisory -
Check if you run it
No confirmed exploitation is on record for CVE-2026-96231. EPSS is 0.34%. Act only if a listed version of Microsoft Security Advisory - is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Microsoft Security Advisory -).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.34%
- Remediation
- Version ranges on file
- Affected products
- NuGet Microsoft.NETCore.App.Runtime.linux-arm · NuGet Microsoft.NETCore.App.Runtime.linux-arm64 · NuGet Microsoft.NETCore.App.Runtime.linux-musl-arm · NuGet Microsoft.NETCore.App.Runtime.linux-musl-arm64 · NuGet Microsoft.NETCore.App.Runtime.linux-musl-x64 · NuGet Microsoft.NETCore.App.Runtime.linux-x64
## 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
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- 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
- nuget Microsoft.NETCore.App.Runtime.linux-arm>= 10.0.0, <= 10.0.12
- nuget Microsoft.NETCore.App.Runtime.linux-arm>= 8.0.0, <= 8.0.31
- nuget Microsoft.NETCore.App.Runtime.linux-arm64>= 10.0.0, <= 10.0.12
- nuget Microsoft.NETCore.App.Runtime.linux-arm64>= 8.0.0, <= 8.0.31
- nuget Microsoft.NETCore.App.Runtime.linux-musl-arm>= 10.0.0, <= 10.0.12
- nuget Microsoft.NETCore.App.Runtime.linux-musl-arm>= 8.0.0, <= 8.0.31
- nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64>= 10.0.0, <= 10.0.12
- nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64>= 8.0.0, <= 8.0.31
- nuget Microsoft.NETCore.App.Runtime.linux-musl-x64>= 8.0.0, <= 8.0.31
- nuget Microsoft.NETCore.App.Runtime.linux-x64>= 8.0.0, <= 8.0.31
- nuget Microsoft.NETCore.App.Runtime.osx-arm64>= 8.0.0, <= 8.0.31
- nuget Microsoft.NETCore.App.Runtime.osx-x64>= 8.0.0, <= 8.0.31
How to fix CVE-2026-96231
Recommended remediation
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-96231. EPSS is 0.34%. Act only if a listed version of Microsoft Security Advisory - is installed.
Which versions are affected?
Compare what you have installed with Microsoft.NETCore.App.Runtime.linux-arm 10.0.0 → 10.0.13; Microsoft.NETCore.App.Runtime.linux-arm 8.0.0 → 8.0.32; Microsoft.NETCore.App.Runtime.linux-arm64 10.0.0 → 10.0.13; Microsoft.NETCore.App.Runtime.linux-arm64 8.0.0 → 8.0.32. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-59: Link Following. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
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
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
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-arm fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-arm64 fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-musl-arm fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-musl-arm64 fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-musl-x64 fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-x64 fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.osx-arm64 fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.osx-x64 fixed in 8.0.32
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-arm fixed in 10.0.13
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-arm64 fixed in 10.0.13
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-musl-arm fixed in 10.0.13
Oct 13, 2026 · GitHub Advisory Database
Fix available
Microsoft.NETCore.App.Runtime.linux-musl-arm64 fixed in 10.0.13
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
Sources
- CVE.orgVulnerability recordCVE-2026-96231
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-96231
30-day exploitation probability 0.3%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-2j93-m82w-73j2
GitHub Advisory Database record mirrored by OSV.
github.com - OpenSSF OSV / OSV ScannerPackage advisoryGHSA-2j93-m82w-73j2
Microsoft Security Advisory CVE-2026-96231 - .NET and Visual Studio Elevation of Privilege Vulnerability
osv.dev
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.