========================================================================== Ubuntu Security Notice USN-7822-1 October 16, 2025
dotnet8, dotnet9, dotnet10 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 25.04 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in .NET Software Description: - dotnet10: .NET CLI tools and runtime - dotnet8: .NET CLI tools and runtime - dotnet9: .NET CLI tools and runtime Details: It was discovered that .NET did not properly handle the creation of temporary build time directories. An attacker could possibly use this issue to cause a denial of service. (CVE-2025-55247) It was discovered that .NET did not properly establish TLS sessions for SMTP server connections. An attacker could use this issue to cause .NET to use unencrypted connections. This issue only affects .NET versions 8.0 and 9.0. (CVE-2025-55248) It was discovered that .NET inconsistently interpreted certain http requests. An attacker could possibly use this to bypass a security feature over a network. (CVE-2025-55315) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 aspnetcore-runtime-10.0 10.0.0~rc2-0ubuntu1~25.10.2 aspnetcore-runtime-8.0 8.0.21-0ubuntu1~25.10.1 aspnetcore-runtime-9.0 9.0.10-0ubuntu1~25.10.1 dotnet-host-10.0 10.0.0~rc2-0ubuntu1~25.10.2 dotnet-host-8.0 8.0.21-0ubuntu1~25.10.1 dotnet-host-9.0 9.0.10-0ubuntu1~25.10.1 dotnet-hostfxr-10.0 10.0.0~rc2-0ubuntu1~25.10.2 dotnet-hostfxr-8.0 8.0.21-0ubuntu1~25.10.1 dotnet-hostfxr-9.0 9.0.10-0ubuntu1~25.10.1 dotnet-runtime-10.0 10.0.0~rc2-0ubuntu1~25.10.2 dotnet-runtime-8.0 8.0.21-0ubuntu1~25.10.1 dotnet-runtime-9.0 9.0.10-0ubuntu1~25.10.1 dotnet-sdk-10.0 10.0.100~rc2-0ubuntu1~25.10.2 dotnet-sdk-8.0 8.0.121-0ubuntu1~25.10.1 dotnet-sdk-9.0 9.0.111-0ubuntu1~25.10.1 dotnet-sdk-aot-10.0 10.0.100~rc2-0ubuntu1~25.10.2 dotnet-sdk-aot-9.0 9.0.111-0ubuntu1~25.10.1 dotnet10 10.0.100-10.0.0~rc2-0ubuntu1~25.10.2 dotnet8 8.0.121-8.0.21-0ubuntu1~25.10.1 dotnet9 9.0.111-9.0.10-0ubuntu1~25.10.1 Ubuntu 25.04 aspnetcore-runtime-8.0 8.0.21-0ubuntu1~25.04.1 aspnetcore-runtime-9.0 9.0.10-0ubuntu1~25.04.1 dotnet-host-8.0 8.0.21-0ubuntu1~25.04.1 dotnet-host-9.0 9.0.10-0ubuntu1~25.04.1 dotnet-hostfxr-8.0 8.0.21-0ubuntu1~25.04.1 dotnet-hostfxr-9.0 9.0.10-0ubuntu1~25.04.1 dotnet-runtime-8.0 8.0.21-0ubuntu1~25.04.1 dotnet-runtime-9.0 9.0.10-0ubuntu1~25.04.1 dotnet-sdk-8.0 8.0.121-0ubuntu1~25.04.1 dotnet-sdk-9.0 9.0.111-0ubuntu1~25.04.1 dotnet-sdk-aot-9.0 9.0.111-0ubuntu1~25.04.1 dotnet8 8.0.121-8.0.21-0ubuntu1~25.04.1 dotnet9 9.0.111-9.0.10-0ubuntu1~25.04.1 Ubuntu 24.04 LTS aspnetcore-runtime-8.0 8.0.21-0ubuntu1~24.04.1 dotnet-host-8.0 8.0.21-0ubuntu1~24.04.1 dotnet-hostfxr-8.0 8.0.21-0ubuntu1~24.04.1 dotnet-runtime-8.0 8.0.21-0ubuntu1~24.04.1 dotnet-sdk-8.0 8.0.121-0ubuntu1~24.04.1 dotnet8 8.0.121-8.0.21-0ubuntu1~24.04.1 Ubuntu 22.04 LTS aspnetcore-runtime-8.0 8.0.21-0ubuntu1~22.04.1 dotnet-host-8.0 8.0.21-0ubuntu1~22.04.1 dotnet-hostfxr-8.0 8.0.21-0ubuntu1~22.04.1 dotnet-runtime-8.0 8.0.21-0ubuntu1~22.04.1 dotnet-sdk-8.0 8.0.121-0ubuntu1~22.04.1 dotnet8 8.0.121-8.0.21-0ubuntu1~22.04.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-7822-1 CVE-2025-55247, CVE-2025-55248, CVE-2025-55315 Package Information: https://launchpad.net/ubuntu/+source/dotnet10/10.0.100-10.0.0~rc2-0ubuntu1~25.10.2 https://launchpad.net/ubuntu/+source/dotnet8/8.0.121-8.0.21-0ubuntu1~25.10.1 https://launchpad.net/ubuntu/+source/dotnet9/9.0.111-9.0.10-0ubuntu1~25.10.1 https://launchpad.net/ubuntu/+source/dotnet8/8.0.121-8.0.21-0ubuntu1~25.04.1 https://launchpad.net/ubuntu/+source/dotnet9/9.0.111-9.0.10-0ubuntu1~25.04.1 https://launchpad.net/ubuntu/+source/dotnet8/8.0.121-8.0.21-0ubuntu1~24.04.1 https://launchpad.net/ubuntu/+source/dotnet8/8.0.121-8.0.21-0ubuntu1~22.04.1
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