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ALSA-2025:18148 — Important: .NET 8.0 security update

Affected: AlmaLinux:8: aspnetcore-runtime-8.0, AlmaLinux:8: aspnetcore-runtime-dbg-8.0, AlmaLinux:8: aspnetcore-targeting-pack-8.0, AlmaLinux:8: dotnet-apphost-pack-8.0, AlmaLinux:8: dotnet-hostfxr-8.0, AlmaLinux:8: dotnet-runtime-8.0, AlmaLinux:8: dotnet-runtime-dbg-8.0, AlmaLinux:8: dotnet-sdk-8.0, AlmaLinux:8: dotnet-sdk-8.0-source-built-artifacts, AlmaLinux:8: dotnet-sdk-dbg-8.0 and 2 more

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.121 and .NET Runtime 8.0.21.Security Fix(es):

* dotnet: .NET Information Disclosure Vulnerability (CVE-2025-55248) * dotnet: .NET Security Feature Bypass Vulnerability (CVE-2025-55315) * dotnet: .NET Denial of Service Vulnerability (CVE-2025-55247)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2025-13256

BELL-CVE-2025-55247

Affected: Alpaquita:25: dotnet8-runtime, Alpaquita:25: dotnet8-sdk, Alpaquita:stream: dotnet8-runtime, Alpaquita:stream: dotnet8-sdk

BIT-dotnet-2025-55247 — .NET Elevation of Privilege Vulnerability

Affected: Bitnami: dotnet

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.

certfr-2025-avi-0880 — De multiples vulnérabilités ont été découvertes dans Microsoft .Net. Elles permettent à un attaquant de provoquer une é…

certfr-2025-avi-0880

EUVD-2026-269111

fkie_cve-2025-55247

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.

GHSA-w3q9-fxm7-j8fq — Microsoft Security Advisory CVE-2025-55247 | .NET Denial of Service Vulnerability

Affected: NuGet: Microsoft.Build.Tasks.Core, NuGet: Microsoft.Build, NuGet: Microsoft.Build.Utilities.Core

# Microsoft Security Advisory CVE-2025-55247 | .NET Denial of Service Vulnerability

## <a name="executive-summary"></a>Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0.xxx, .NET 9.0.xxx and .NET 10.0.xxx. This advisory also provides guidance on what developers can do to update their environments to remove this vulnerability.

A vulnerability exists in .NET where predictable paths for MSBuild's temporary directories on Linux let another user create the directories ahead of MSBuild, leading to DoS of builds. This only affects .NET on Linux operating systems.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/370

### <a name="mitigation-factors"></a>Mitigation factors

Projects which do not utilize the [DownloadFile](https://learn.microsoft.com/visualstudio/msbuild/downloadfile-task) build task are not susceptible to this vulnerability.

## <a name="affected-software"></a>Affected software

* Any installation of .NET 10.0.100-rc.1.25451.107 SDK or earlier. * Any installation of .NET 9.0.110 SDK, .NET 9.0.305 SDK or earlier. * Any installation of .NET 8.0.120 SDK, .NET 8.0.317 SDK, .NET 8.0.414 SDK or earlier.

## <a name="affected-packages"></a>Affected Packages

The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below

Package name |Affected version | Patched version ------------ |-----…

msrc_CVE-2025-55247 — .NET Elevation of Privilege Vulnerability

msrc_CVE-2025-55247

RHBA-2025:20916 — Red Hat Bug Fix Advisory: .NET 10.0 bug fix and enhancement update

dotnet: .NET Denial of Service Vulnerability dotnet: .NET Security Feature Bypass Vulnerability

RHBA-2025:20993 — Red Hat Bug Fix Advisory: .NET 10.0 bug fix and enhancement update

dotnet: .NET Denial of Service Vulnerability dotnet: .NET Security Feature Bypass Vulnerability

UBUNTU-CVE-2025-55247

Affected: Ubuntu:22.04:LTS: dotnet6, Ubuntu:22.04:LTS: dotnet7, Ubuntu:22.04:LTS: dotnet8, Ubuntu:24.04:LTS: dotnet10, Ubuntu:24.04:LTS: dotnet8, Ubuntu:25.10: dotnet10, Ubuntu:25.10: dotnet8, Ubuntu:25.10: dotnet9, Ubuntu:26.04:LTS: dotnet10

Improper link resolution before file access ('link following') in .NET allows an authorized attacker to elevate privileges locally.

WID-SEC-W-2025-2278 — Microsoft Developer Tools: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Visual Studio, .NET Framework, Windows Server, ASP.NET, PowerShell und Windows ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um seine Privilegien zu erhöhen, und um Informationen offenzulegen.