{"uuid": "af6f92b7-28bc-491c-a949-8252e06c9f53", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-62909", "type": "seen", "source": "https://gist.github.com/alon710/1bbb962ba5fe1e0ea9ceba5b2cf3a088", "content": "# CVE-2026-62909: CVE-2026-62909: .NET Local Elevation of Privilege via Unchecked Diagnostic Socket Permissions\n\n> **CVSS Score:** 7.8\n> **Published:** 2026-08-11\n> **Full Report:** https://cvereports.com/reports/CVE-2026-62909\n\n## Summary\nA high-severity Local Elevation of Privilege (EoP) vulnerability exists in the Microsoft .NET runtime and Visual Studio on Unix-like platforms. The flaw arises from an unchecked return value (CWE-252) during the initialization of the Diagnostics Inter-Process Communication (IPC) socket. By exploiting this vulnerability, a low-privileged local attacker can execute arbitrary commands with the privileges of a higher-privileged .NET process.\n\n## TL;DR\nAn unchecked return value on permission-setting system calls for Unix Domain Sockets in the .NET runtime allows local privilege escalation to root on macOS and Linux.\n\n## Technical Details\n\n- **CWE ID**: CWE-252\n- **Attack Vector**: Local (AV:L)\n- **CVSS**: 7.8 (High)\n- **Impact**: Local Elevation of Privilege\n- **Exploit Status**: None (No weaponized public PoCs)\n- **KEV Status**: Not listed\n\n## Affected Systems\n\n- .NET 10.0\n- .NET 9.0\n- .NET 8.0\n- Visual Studio 2022\n- Visual Studio 2026\n\n## Mitigation\n\n- Upgrade the .NET runtime environment to a non-vulnerable servicing release.\n- Apply restrictive process umask policies (0077) to ensure safe default socket creation parameters.\n- Relocate diagnostic socket generation folders to directories with restricted user-only access.\n- Disable the .NET diagnostics server endpoint completely in workloads where debugging is not required.\n\n**Remediation Steps:**\n1. Identify active .NET deployment runtimes across Unix-like container hosts and Virtual Machines.\n2. Apply the platform-specific patch updating .NET 10.0 to 10.0.11, .NET 9.0 to 9.0.19, or .NET 8.0 to 8.0.30.\n3. For temporary containment, set the system environment variable DOTNET_EnableDiagnostics=0 on production hosts.\n\n## References\n\n- [Microsoft Security Response Center Advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62909)\n- [CVE Record](https://www.cve.org/CVERecord?id=CVE-2026-62909)\n\n\n---\n*Generated by [CVEReports](https://cvereports.com/reports/CVE-2026-62909) - Automated Vulnerability Intelligence*", "creation_timestamp": "2026-08-12T00:32:54.128061Z"}