Ubuntu alert USN-8298-1 (dotnet8, dotnet9, dotnet10)

From:
             
 
noreply+usn-bot@canonical.com
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8298-1] .NET vulnerability
Date:
             
 
Mon, 25 May 2026 21:52:58 +0000
Message-ID:
             
 
<E1wRdEI-0002Vt-6X@lists.ubuntu.com>
==========================================================================
Ubuntu Security Notice USN-8298-1
May 25, 2026

dotnet8, dotnet9, dotnet10 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

.NET could be made to consume excessive resources if it received specially
crafted network traffic.

Software Description:
- dotnet10: .NET CLI tools and runtime
- dotnet8: .NET CLI tools and runtime
- dotnet9: .NET CLI tools and runtime

Details:

Muhammad Abdul Rehman discovered that .NET incorrectly handled certain
network requests, leading to a loop with an unreachable exit condition. A
remote attacker could possibly use this issue to consume excessive
resources, resulting in a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  aspnetcore-runtime-10.0         10.0.8-0ubuntu1~26.04.1
  dotnet-host-10.0                10.0.8-0ubuntu1~26.04.1
  dotnet-hostfxr-10.0             10.0.8-0ubuntu1~26.04.1
  dotnet-runtime-10.0             10.0.8-0ubuntu1~26.04.1
  dotnet-sdk-10.0                 10.0.108-0ubuntu1~26.04.1
  dotnet-sdk-aot-10.0             10.0.108-0ubuntu1~26.04.1
  dotnet-sdk-dbg-10.0             10.0.108-0ubuntu1~26.04.1
  dotnet10                        10.0.108-10.0.8-0ubuntu1~26.04.1

Ubuntu 25.10
  aspnetcore-runtime-10.0         10.0.8-0ubuntu1~25.10.1
  aspnetcore-runtime-8.0          8.0.27-0ubuntu1~25.10.1
  aspnetcore-runtime-9.0          9.0.16-0ubuntu1~25.10.1
  dotnet-host-10.0                10.0.8-0ubuntu1~25.10.1
  dotnet-host-8.0                 8.0.27-0ubuntu1~25.10.1
  dotnet-host-9.0                 9.0.16-0ubuntu1~25.10.1
  dotnet-hostfxr-10.0             10.0.8-0ubuntu1~25.10.1
  dotnet-hostfxr-8.0              8.0.27-0ubuntu1~25.10.1
  dotnet-hostfxr-9.0              9.0.16-0ubuntu1~25.10.1
  dotnet-runtime-10.0             10.0.8-0ubuntu1~25.10.1
  dotnet-runtime-8.0              8.0.27-0ubuntu1~25.10.1
  dotnet-runtime-9.0              9.0.16-0ubuntu1~25.10.1
  dotnet-sdk-10.0                 10.0.108-0ubuntu1~25.10.1
  dotnet-sdk-8.0                  8.0.127-0ubuntu1~25.10.1
  dotnet-sdk-9.0                  9.0.117-0ubuntu1~25.10.1
  dotnet-sdk-aot-10.0             10.0.108-0ubuntu1~25.10.1
  dotnet-sdk-aot-9.0              9.0.117-0ubuntu1~25.10.1
  dotnet-sdk-dbg-10.0             10.0.108-0ubuntu1~25.10.1
  dotnet-sdk-dbg-8.0              8.0.127-0ubuntu1~25.10.1
  dotnet-sdk-dbg-9.0              9.0.117-0ubuntu1~25.10.1
  dotnet10                        10.0.108-10.0.8-0ubuntu1~25.10.1
  dotnet8                         8.0.127-8.0.27-0ubuntu1~25.10.1
  dotnet9                         9.0.117-9.0.16-0ubuntu1~25.10.1

Ubuntu 24.04 LTS
  aspnetcore-runtime-10.0         10.0.8-0ubuntu1~24.04.1
  aspnetcore-runtime-8.0          8.0.27-0ubuntu1~24.04.1
  dotnet-host-10.0                10.0.8-0ubuntu1~24.04.1
  dotnet-host-8.0                 8.0.27-0ubuntu1~24.04.1
  dotnet-hostfxr-10.0             10.0.8-0ubuntu1~24.04.1
  dotnet-hostfxr-8.0              8.0.27-0ubuntu1~24.04.1
  dotnet-runtime-10.0             10.0.8-0ubuntu1~24.04.1
  dotnet-runtime-8.0              8.0.27-0ubuntu1~24.04.1
  dotnet-sdk-10.0                 10.0.108-0ubuntu1~24.04.1
  dotnet-sdk-8.0                  8.0.127-0ubuntu1~24.04.1
  dotnet-sdk-aot-10.0             10.0.108-0ubuntu1~24.04.1
  dotnet-sdk-dbg-10.0             10.0.108-0ubuntu1~24.04.1
  dotnet10                        10.0.108-10.0.8-0ubuntu1~24.04.1
  dotnet8                         8.0.127-8.0.27-0ubuntu1~24.04.1

Ubuntu 22.04 LTS
  aspnetcore-runtime-8.0          8.0.27-0ubuntu1~22.04.1
  dotnet-host-8.0                 8.0.27-0ubuntu1~22.04.1
  dotnet-hostfxr-8.0              8.0.27-0ubuntu1~22.04.1
  dotnet-runtime-8.0              8.0.27-0ubuntu1~22.04.1
  dotnet-sdk-8.0                  8.0.127-0ubuntu1~22.04.1
  dotnet8                         8.0.127-8.0.27-0ubuntu1~22.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8298-1
  CVE-2026-42899

Package Information:
  https://launchpad.net/ubuntu/+source/dotnet10/10.0.108-10...
  https://launchpad.net/ubuntu/+source/dotnet10/10.0.108-10...
  https://launchpad.net/ubuntu/+source/dotnet8/8.0.127-8.0....
  https://launchpad.net/ubuntu/+source/dotnet9/9.0.117-9.0....
  https://launchpad.net/ubuntu/+source/dotnet10/10.0.108-10...
  https://launchpad.net/ubuntu/+source/dotnet8/8.0.127-8.0....
  https://launchpad.net/ubuntu/+source/dotnet8/8.0.127-8.0....


Attachment: signature.asc (type=application/pgp-signature)
-----BEGIN PGP SIGNATURE-----
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=OkRH
-----END PGP SIGNATURE-----