Oracle has released several security updates for their Linux distributions. The most significant update is a "dtrace" security fix, which addresses a vulnerability (CVE-2026-21991) that could be exploited to gain unauthorized access. This update affects Oracle Linux 8 and 9, as well as older versions. The dtrace security update includes updated rpms for x86_64 and aarch64 architectures, including the main "dtrace" package, as well as development and testing tools. The update is available on the Unbreakable Linux Network (ULN) and can be downloaded from the provided links. Additionally, Oracle has also released an important security update for .NET 9.0 on Oracle Linux 8, which addresses two vulnerabilities (CVE-2026-26127 and CVE-2026-26130).

ELSA-2026-50153 Moderate: dtrace security update
ELSA-2026-50153 Moderate: Oracle Linux 9 dtrace security update
ELSA-2026-50152 Moderate: Oracle Linux 9 dtrace security update
ELSA-2026-50152 Moderate: Oracle Linux 9 dtrace security update
ELSA-2026-50152 Moderate: Oracle Linux 8 dtrace security update
ELSA-2026-50151 Moderate: Oracle Linux 8 dtrace security update
ELSA-2026-4443 Important: Oracle Linux 8 .NET 9.0 security update
ELSA-2026-50151 Moderate: Oracle Linux 8 dtrace security update

ELSA-2026-50153 Moderate: dtrace security update

Oracle Linux Security Advisory ELSA-2026-50153

http://linux.oracle.com/errata/ELSA-2026-50153.html

The following updated rpms for have been uploaded to the Unbreakable Linux Network:

x86_64:
dtrace-devel-2.0.6-1.el10.x86_64.rpm
dtrace-testsuite-2.0.6-1.el10.x86_64.rpm
dtrace-2.0.6-1.el10.x86_64.rpm

aarch64:
dtrace-devel-2.0.6-1.el10.aarch64.rpm
dtrace-testsuite-2.0.6-1.el10.aarch64.rpm
dtrace-2.0.6-1.el10.aarch64.rpm

SRPMS:
http://oss.oracle.com/ol10/SRPMS-updates/dtrace-2.0.6-1.el10.src.rpm

Related CVEs:

CVE-2026-21991

Description of changes:

[2.0.6-1]
- Fix dtprobed unsafe probe description handling (CVE-2026-21991).
[Orabug: 39054018]

Credit Statement:
The following people or organizations reported security vulnerabilities addressed by this ELSA to Oracle:
Dhiraj Mishra: CVE-2026-21991

ELSA-2026-50153 Moderate: Oracle Linux 9 dtrace security update

Oracle Linux Security Advisory ELSA-2026-50153

http://linux.oracle.com/errata/ELSA-2026-50153.html

The following updated rpms for Oracle Linux 9 have been uploaded to the Unbreakable Linux Network:

x86_64:
dtrace-2.0.6-1.el9.x86_64.rpm
dtrace-devel-2.0.6-1.el9.x86_64.rpm
dtrace-testsuite-2.0.6-1.el9.x86_64.rpm

aarch64:
dtrace-2.0.6-1.el9.aarch64.rpm
dtrace-devel-2.0.6-1.el9.aarch64.rpm
dtrace-testsuite-2.0.6-1.el9.aarch64.rpm

SRPMS:
http://oss.oracle.com/ol9/SRPMS-updates/dtrace-2.0.6-1.el9.src.rpm

Related CVEs:

CVE-2026-21991

Description of changes:

[2.0.6-1]
- Fix dtprobed unsafe probe description handling (CVE-2026-21991).
[Orabug: 39054018]

Credit Statement:
The following people or organizations reported security vulnerabilities addressed by this ELSA to Oracle:
Dhiraj Mishra: CVE-2026-21991

ELSA-2026-50152 Moderate: Oracle Linux 9 dtrace security update

Oracle Linux Security Advisory ELSA-2026-50152

http://linux.oracle.com/errata/ELSA-2026-50152.html

The following updated rpms for Oracle Linux 9 have been uploaded to the Unbreakable Linux Network:

aarch64:
dtrace-2.0.6-1.el9.aarch64.rpm
dtrace-devel-2.0.6-1.el9.aarch64.rpm
dtrace-testsuite-2.0.6-1.el9.aarch64.rpm

SRPMS:
http://oss.oracle.com/ol9/SRPMS-updates/dtrace-2.0.6-1.el9.src.rpm

Related CVEs:

CVE-2026-21991

Description of changes:

[2.0.6-1]
- Fix dtprobed unsafe probe description handling (CVE-2026-21991).
[Orabug: 39054018]

Credit Statement:
The following people or organizations reported security vulnerabilities addressed by this ELSA to Oracle:
Dhiraj Mishra: CVE-2026-21991

ELSA-2026-50152 Moderate: Oracle Linux 9 dtrace security update

Oracle Linux Security Advisory ELSA-2026-50152

http://linux.oracle.com/errata/ELSA-2026-50152.html

The following updated rpms for Oracle Linux 9 have been uploaded to the Unbreakable Linux Network:

x86_64:
dtrace-2.0.6-1.el9.x86_64.rpm
dtrace-devel-2.0.6-1.el9.x86_64.rpm
dtrace-testsuite-2.0.6-1.el9.x86_64.rpm

SRPMS:
http://oss.oracle.com/ol9/SRPMS-updates/dtrace-2.0.6-1.el9.src.rpm

Related CVEs:

CVE-2026-21991

Description of changes:

[2.0.6-1]
- Fix dtprobed unsafe probe description handling (CVE-2026-21991).
[Orabug: 39054018]

Credit Statement:
The following people or organizations reported security vulnerabilities addressed by this ELSA to Oracle:
Dhiraj Mishra: CVE-2026-21991

ELSA-2026-50152 Moderate: Oracle Linux 8 dtrace security update

Oracle Linux Security Advisory ELSA-2026-50152

http://linux.oracle.com/errata/ELSA-2026-50152.html

The following updated rpms for Oracle Linux 8 have been uploaded to the Unbreakable Linux Network:

x86_64:
dtrace-2.0.6-1.el8.x86_64.rpm
dtrace-devel-2.0.6-1.el8.x86_64.rpm
dtrace-testsuite-2.0.6-1.el8.x86_64.rpm

aarch64:
dtrace-2.0.6-1.el8.aarch64.rpm
dtrace-devel-2.0.6-1.el8.aarch64.rpm
dtrace-testsuite-2.0.6-1.el8.aarch64.rpm

SRPMS:
http://oss.oracle.com/ol8/SRPMS-updates/dtrace-2.0.6-1.el8.src.rpm

Related CVEs:

CVE-2026-21991

Description of changes:

[2.0.6-1]
- Fix dtprobed unsafe probe description handling (CVE-2026-21991).
[Orabug: 39054018]

Credit Statement:
The following people or organizations reported security vulnerabilities addressed by this ELSA to Oracle:
Dhiraj Mishra: CVE-2026-21991

ELSA-2026-50151 Moderate: Oracle Linux 8 dtrace security update

Oracle Linux Security Advisory ELSA-2026-50151

http://linux.oracle.com/errata/ELSA-2026-50151.html

The following updated rpms for Oracle Linux 8 have been uploaded to the Unbreakable Linux Network:

x86_64:
dtrace-2.0.6-1.el8.x86_64.rpm
dtrace-devel-2.0.6-1.el8.x86_64.rpm
dtrace-testsuite-2.0.6-1.el8.x86_64.rpm

SRPMS:
http://oss.oracle.com/ol8/SRPMS-updates/dtrace-2.0.6-1.el8.src.rpm

Related CVEs:

CVE-2026-21991

Description of changes:

[2.0.6-1]
- Fix dtprobed unsafe probe description handling (CVE-2026-21991).
[Orabug: 39054018]

Credit Statement:
The following people or organizations reported security vulnerabilities addressed by this ELSA to Oracle:
Dhiraj Mishra: CVE-2026-21991

ELSA-2026-4443 Important: Oracle Linux 8 .NET 9.0 security update

Oracle Linux Security Advisory ELSA-2026-4443

http://linux.oracle.com/errata/ELSA-2026-4443.html

The following updated rpms for Oracle Linux 8 have been uploaded to the Unbreakable Linux Network:

x86_64:
aspnetcore-runtime-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
aspnetcore-runtime-dbg-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
aspnetcore-targeting-pack-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
dotnet-apphost-pack-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
dotnet-hostfxr-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
dotnet-runtime-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
dotnet-runtime-dbg-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
dotnet-sdk-9.0-9.0.115-1.0.1.el8_10.x86_64.rpm
dotnet-sdk-9.0-source-built-artifacts-9.0.115-1.0.1.el8_10.x86_64.rpm
dotnet-sdk-aot-9.0-9.0.115-1.0.1.el8_10.x86_64.rpm
dotnet-sdk-dbg-9.0-9.0.115-1.0.1.el8_10.x86_64.rpm
dotnet-targeting-pack-9.0-9.0.14-1.0.1.el8_10.x86_64.rpm
dotnet-templates-9.0-9.0.115-1.0.1.el8_10.x86_64.rpm
netstandard-targeting-pack-2.1-9.0.115-1.0.1.el8_10.x86_64.rpm

aarch64:
aspnetcore-runtime-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
aspnetcore-runtime-dbg-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
aspnetcore-targeting-pack-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
dotnet-apphost-pack-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
dotnet-hostfxr-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
dotnet-runtime-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
dotnet-runtime-dbg-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
dotnet-sdk-9.0-9.0.115-1.0.1.el8_10.aarch64.rpm
dotnet-sdk-9.0-source-built-artifacts-9.0.115-1.0.1.el8_10.aarch64.rpm
dotnet-sdk-aot-9.0-9.0.115-1.0.1.el8_10.aarch64.rpm
dotnet-sdk-dbg-9.0-9.0.115-1.0.1.el8_10.aarch64.rpm
dotnet-targeting-pack-9.0-9.0.14-1.0.1.el8_10.aarch64.rpm
dotnet-templates-9.0-9.0.115-1.0.1.el8_10.aarch64.rpm
netstandard-targeting-pack-2.1-9.0.115-1.0.1.el8_10.aarch64.rpm

SRPMS:
http://oss.oracle.com/ol8/SRPMS-updates/dotnet9.0-9.0.115-1.0.1.el8_10.src.rpm

Related CVEs:

CVE-2026-26127
CVE-2026-26130

Description of changes:

[9.0.115-1.0.1]
- Add support for Oracle Linux

[9.0.115-1]
- Update to .NET SDK 9.0.115 and Runtime 9.0.14
- Resolves: RHEL-152941

ELSA-2026-50151 Moderate: Oracle Linux 8 dtrace security update

Oracle Linux Security Advisory ELSA-2026-50151

http://linux.oracle.com/errata/ELSA-2026-50151.html

The following updated rpms for Oracle Linux 8 have been uploaded to the Unbreakable Linux Network:

aarch64:
dtrace-2.0.6-1.el8.aarch64.rpm
dtrace-devel-2.0.6-1.el8.aarch64.rpm
dtrace-testsuite-2.0.6-1.el8.aarch64.rpm

SRPMS:
http://oss.oracle.com/ol8/SRPMS-updates/dtrace-2.0.6-1.el8.src.rpm

Related CVEs:

CVE-2026-21991

Description of changes:

[2.0.6-1]
- Fix dtprobed unsafe probe description handling (CVE-2026-21991).
[Orabug: 39054018]

Credit Statement:
The following people or organizations reported security vulnerabilities addressed by this ELSA to Oracle:
Dhiraj Mishra: CVE-2026-21991