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RLSA-2026:86171

Security Mirrored from RHSA-2026:86171
Issued at: 2026-10-22
Updated at: 2026-10-22

Advisory content derived from Red Hat RHSA-2026:86171, © Red Hat, Inc., used under CC BY 4.0, with modifications.

Synopsis

Critical: .NET 9.0 security, bug fix, and enhancement update



Description

.NET is a fast, lightweight and modular platform for creating cross platform applications that work on Linux, macOS and Windows. It particularly focuses on creating console applications, web applications and micro-services. .NET contains a runtime conforming to .NET Standards a set of framework libraries, an SDK containing compilers and a 'dotnet' application to drive everything.

SDK version: 9.0.122

Runtime version: 9.0.21

Security Fix(es):

* dotnet10.0: dotnet9.0: dotnet: dotnet8.0: .NET Denial of Service Vulnerability (CVE-2026-58280)

* dotnet10.0: dotnet8.0: dotnet9.0: dotnet: .NET Information Disclosure Vulnerability (CVE-2026-66822)

* dotnet9.0: dotnet: dotnet10.0: dotnet8.0: .NET Denial of Service Vulnerability (CVE-2026-69651)

* dotnet8.0: dotnet10.0: dotnet: dotnet9.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70159)

* dotnet10.0: dotnet8.0: dotnet9.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70175)

* dotnet10.0: dotnet8.0: dotnet9.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70179)

* dotnet9.0: dotnet8.0: dotnet10.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70181)

* dotnet: dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Elevation of Privilege Vulnerability (CVE-2026-70183)

* dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70186)

* dotnet: ASP.NET Core Security Feature Bypass Vulnerability (CVE-2026-70188)

* dotnet9.0: dotnet8.0: dotnet10.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-70196)

* dotnet: ASP.NET Core Tampering Vulnerability (CVE-2026-88092)

* dotnet10.0: dotnet8.0: dotnet9.0: dotnet: MessagePack: Nested arrays can blow past buffer length limits (CVE-2026-92707)

* dotnet: dotnet8.0: dotnet9.0: dotnet10.0: .NET Elevation of Privilege Vulnerability (CVE-2026-96225)

* dotnet9.0: dotnet10.0: dotnet8.0: dotnet: ASP.NET Core Remote Code Execution Vulnerability (CVE-2026-96230)

* dotnet: dotnet9.0: dotnet10.0: dotnet8.0: .NET Elevation of Privilege Vulnerability (CVE-2026-96231)

* dotnet10.0: dotnet: dotnet8.0: dotnet9.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-96233)

* dotnet: dotnet10.0: dotnet9.0: dotnet8.0: ASP.NET Core Denial of Service Vulnerability (CVE-2026-96236)

* dotnet8.0: dotnet10.0: dotnet9.0: .NET Remote Code Execution Vulnerability (CVE-2026-96237)

* dotnet8.0: dotnet10.0: dotnet9.0: dotnet: .NET Security Feature Bypass Vulnerability (CVE-2026-96238)

Bug Fix(es) and Enhancement(s):

* Update .NET 9.0 to SDK 9.0.122 and Runtime 9.0.21 [rhel-9.8.z] (JIRA:Rocky Linux-277800)

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.



Affected products

Rocky Linux 9 aarch64 Rocky Linux 9 ppc64le Rocky Linux 9 s390x Rocky Linux 9 x86_64

Fixes

2548778 2548781 2548784 2548786 2548787 2548790 2548791 2548792 2548793 2548796 2548798 2548799 2548800 2548803 2548804 2548805 2548806 2548807 2548808 2548809

CVEs

CVE-2026-58280 CVE-2026-66822 CVE-2026-69651 CVE-2026-70159 CVE-2026-70175 CVE-2026-70179 CVE-2026-70181 CVE-2026-70183 CVE-2026-70186 CVE-2026-70188 CVE-2026-70196 CVE-2026-88092 CVE-2026-92707 CVE-2026-96225 CVE-2026-96230 CVE-2026-96231 CVE-2026-96233 CVE-2026-96236 CVE-2026-96237 CVE-2026-96238

Affected packages

Rocky Linux 9 aarch64 - AppStream

aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.aarch64.rpm aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.aarch64.rpm aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.aarch64.rpm dotnet9.0-0:9.0.122-1.el9_8.src.rpm dotnet9.0-debuginfo-0:9.0.122-1.el9_8.aarch64.rpm dotnet9.0-debugsource-0:9.0.122-1.el9_8.aarch64.rpm dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.aarch64.rpm dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.aarch64.rpm dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.aarch64.rpm dotnet-hostfxr-9.0-debuginfo-0:9.0.21-1.el9_8.aarch64.rpm dotnet-runtime-9.0-0:9.0.21-1.el9_8.aarch64.rpm dotnet-runtime-9.0-debuginfo-0:9.0.21-1.el9_8.aarch64.rpm dotnet-runtime-dbg-9.0-0:9.0.21-1.el9_8.aarch64.rpm dotnet-sdk-9.0-0:9.0.122-1.el9_8.aarch64.rpm dotnet-sdk-9.0-debuginfo-0:9.0.122-1.el9_8.aarch64.rpm dotnet-sdk-aot-9.0-0:9.0.122-1.el9_8.aarch64.rpm dotnet-sdk-aot-9.0-debuginfo-0:9.0.122-1.el9_8.aarch64.rpm dotnet-sdk-dbg-9.0-0:9.0.122-1.el9_8.aarch64.rpm dotnet-targeting-pack-9.0-0:9.0.21-1.el9_8.aarch64.rpm dotnet-templates-9.0-0:9.0.122-1.el9_8.aarch64.rpm netstandard-targeting-pack-2.1-0:9.0.122-1.el9_8.aarch64.rpm

Rocky Linux 9 ppc64le - AppStream

aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.ppc64le.rpm aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.ppc64le.rpm aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.ppc64le.rpm dotnet9.0-0:9.0.122-1.el9_8.src.rpm dotnet9.0-debuginfo-0:9.0.122-1.el9_8.ppc64le.rpm dotnet9.0-debugsource-0:9.0.122-1.el9_8.ppc64le.rpm dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-hostfxr-9.0-debuginfo-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-runtime-9.0-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-runtime-9.0-debuginfo-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-runtime-dbg-9.0-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-sdk-9.0-0:9.0.122-1.el9_8.ppc64le.rpm dotnet-sdk-9.0-debuginfo-0:9.0.122-1.el9_8.ppc64le.rpm dotnet-sdk-dbg-9.0-0:9.0.122-1.el9_8.ppc64le.rpm dotnet-targeting-pack-9.0-0:9.0.21-1.el9_8.ppc64le.rpm dotnet-templates-9.0-0:9.0.122-1.el9_8.ppc64le.rpm netstandard-targeting-pack-2.1-0:9.0.122-1.el9_8.ppc64le.rpm

Rocky Linux 9 s390x - AppStream

aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.s390x.rpm aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.s390x.rpm aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.s390x.rpm dotnet9.0-0:9.0.122-1.el9_8.src.rpm dotnet9.0-debuginfo-0:9.0.122-1.el9_8.s390x.rpm dotnet9.0-debugsource-0:9.0.122-1.el9_8.s390x.rpm dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.s390x.rpm dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.s390x.rpm dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.s390x.rpm dotnet-hostfxr-9.0-debuginfo-0:9.0.21-1.el9_8.s390x.rpm dotnet-runtime-9.0-0:9.0.21-1.el9_8.s390x.rpm dotnet-runtime-9.0-debuginfo-0:9.0.21-1.el9_8.s390x.rpm dotnet-runtime-dbg-9.0-0:9.0.21-1.el9_8.s390x.rpm dotnet-sdk-9.0-0:9.0.122-1.el9_8.s390x.rpm dotnet-sdk-9.0-debuginfo-0:9.0.122-1.el9_8.s390x.rpm dotnet-sdk-dbg-9.0-0:9.0.122-1.el9_8.s390x.rpm dotnet-targeting-pack-9.0-0:9.0.21-1.el9_8.s390x.rpm dotnet-templates-9.0-0:9.0.122-1.el9_8.s390x.rpm netstandard-targeting-pack-2.1-0:9.0.122-1.el9_8.s390x.rpm

Rocky Linux 9 x86_64 - AppStream

aspnetcore-runtime-9.0-0:9.0.21-1.el9_8.x86_64.rpm aspnetcore-runtime-dbg-9.0-0:9.0.21-1.el9_8.x86_64.rpm aspnetcore-targeting-pack-9.0-0:9.0.21-1.el9_8.x86_64.rpm dotnet9.0-0:9.0.122-1.el9_8.src.rpm dotnet9.0-debuginfo-0:9.0.122-1.el9_8.x86_64.rpm dotnet9.0-debugsource-0:9.0.122-1.el9_8.x86_64.rpm dotnet-apphost-pack-9.0-0:9.0.21-1.el9_8.x86_64.rpm dotnet-apphost-pack-9.0-debuginfo-0:9.0.21-1.el9_8.x86_64.rpm dotnet-hostfxr-9.0-0:9.0.21-1.el9_8.x86_64.rpm dotnet-hostfxr-9.0-debuginfo-0:9.0.21-1.el9_8.x86_64.rpm dotnet-runtime-9.0-0:9.0.21-1.el9_8.x86_64.rpm dotnet-runtime-9.0-debuginfo-0:9.0.21-1.el9_8.x86_64.rpm dotnet-runtime-dbg-9.0-0:9.0.21-1.el9_8.x86_64.rpm dotnet-sdk-9.0-0:9.0.122-1.el9_8.x86_64.rpm dotnet-sdk-9.0-debuginfo-0:9.0.122-1.el9_8.x86_64.rpm dotnet-sdk-aot-9.0-0:9.0.122-1.el9_8.x86_64.rpm dotnet-sdk-aot-9.0-debuginfo-0:9.0.122-1.el9_8.x86_64.rpm dotnet-sdk-dbg-9.0-0:9.0.122-1.el9_8.x86_64.rpm dotnet-targeting-pack-9.0-0:9.0.21-1.el9_8.x86_64.rpm dotnet-templates-9.0-0:9.0.122-1.el9_8.x86_64.rpm netstandard-targeting-pack-2.1-0:9.0.122-1.el9_8.x86_64.rpm

Rocky Linux 9 aarch64 - CRB

dotnet-sdk-9.0-source-built-artifacts-0:9.0.122-1.el9_8.aarch64.rpm

Rocky Linux 9 ppc64le - CRB

dotnet-sdk-9.0-source-built-artifacts-0:9.0.122-1.el9_8.ppc64le.rpm

Rocky Linux 9 s390x - CRB

dotnet-sdk-9.0-source-built-artifacts-0:9.0.122-1.el9_8.s390x.rpm

Rocky Linux 9 x86_64 - CRB

dotnet-sdk-9.0-source-built-artifacts-0:9.0.122-1.el9_8.x86_64.rpm