Link following in .NET for Linux - CVE-2025-55247

Vulnerability identifier: #VU117273

CSH Severity: Low

CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-55247

CWE-ID: CWE-59

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an insecure link following issue in .NET. A local user can create a specially crafted symbolic link to a critical file on the system and overwrite it with privileges of the application.

.NET for Linux
Tenable Identity Exposure (formerly Tenable.ad)
Red Hat OpenShift Dev Spaces
Red Hat Enterprise Linux for x86_64
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
dotnet10 (Ubuntu package)
dotnet8.0 (Red Hat package)
dotnet9.0 (Red Hat package)

Install updates from vendor's website.

.NET for Linux - addressed in versions 8.0.21 8.0.21, 9.0.10 9.0.10
Tenable Identity Exposure (formerly Tenable.ad) - addressed in versions 3.77.14, 3.93.4
Red Hat OpenShift Dev Spaces - update to 3.25.0
dotnet10 (Ubuntu package) - addressed in versions 8.0.21-0ubuntu1~22.04.1, 8.0.21-0ubuntu1~24.04.1, 8.0.21-0ubuntu1~25.04.1, 8.0.21-0ubuntu1~25.10.1, 8.0.121-0ubuntu1~22.04.1, 8.0.121-0ubuntu1~24.04.1, 8.0.121-0ubuntu1~25.04.1, 8.0.121-0ubuntu1~25.10.1, 8.0.121-8.0.21-0ubuntu1~22.04.1, 8.0.121-8.0.21-0ubuntu1~24.04.1, 8.0.121-8.0.21-0ubuntu1~25.04.1, 8.0.121-8.0.21-0ubuntu1~25.10.1, 9.0.10-0ubuntu1~25.04.1, 9.0.10-0ubuntu1~25.10.1, 9.0.111-0ubuntu1~25.04.1, 9.0.111-0ubuntu1~25.10.1, 9.0.111-9.0.10-0ubuntu1~25.04.1, 9.0.111-9.0.10-0ubuntu1~25.10.1, 10.0.0~rc2-0ubuntu1~25.10.2, 10.0.100~rc2-0ubuntu1~25.10.2, 10.0.100-10.0.0~rc2-0ubuntu1~25.10.2
dotnet8.0 (Red Hat package) - addressed in versions 8.0.121-1.el8_10, 8.0.121-1.el9_4, 8.0.121-1.el9_6, 8.0.121-1.el10_0
dotnet9.0 (Red Hat package) - addressed in versions 9.0.111-1.el8_10, 9.0.111-1.el9_6, 9.0.111-1.el10_0

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-55247

• Privilege escalation in Microsoft .NET
• Red Hat Enterprise Linux 8 update for .NET 8.0
• Red Hat Enterprise Linux 9 update for .NET 8.0
• Red Hat Enterprise Linux 9 update for .NET 8.0
• Ubuntu update for dotnet10
• Tenable Identity Exposure update for third-party components
• Red Hat Enterprise Linux 10 update for .NET 8.0
• Red Hat Enterprise Linux 10 update for .NET 9.0
• Red Hat Enterprise Linux 8 update for .NET 9.0
• Red Hat Enterprise Linux 9 update for .NET 9.0
• Tenable Identity Exposure 3.77 update for third-party components
• Multiple vulnerabilities in Red Hat OpenShift Dev Spaces