[USN-7535-1] Intel Microcode vulnerabilities

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Ubuntu Security Notice USN-7535-1
May 27, 2025

intel-microcode vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04
- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Intel Microcode.

Software Description:
- intel-microcode: Processor microcode for Intel CPUs

Details:

Sander Wiebing and Cristiano Giuffrida discovered that some Intel®
Processors did not properly handle data in Shared Microarchitectural
Structures during Transient Execution. An authenticated attacker could
possibly use this issue to obtain sensitive information. (CVE-2024-28956)

It was discovered that some Intel® Processors did not properly handle
prediction calculations. An authenticated attacker could possibly use this
issue to obtain sensitive information. (CVE-2024-43420, CVE-2024-45332,
CVE-2025-20623)

It was discovered that some Intel® Processors did not properly initialize
resources in the branch prediction unit. An authenticated attacker could
possibly use this issue to obtain sensitive information. (CVE-2025-20012,
CVE-2025-24495)

Michal Raviv and Jeff Gilbert discovered that some Intel® Processors did
not properly handle resources and exceptions in the core management
mechanism. An authenticated attacker could possibly use this issue to
cause a denial of service. (CVE-2025-20054, CVE-2025-20103)

Update instructions:

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

Ubuntu 25.04
intel-microcode 3.20250512.0ubuntu0.25.04.1

Ubuntu 24.10
intel-microcode 3.20250512.0ubuntu0.24.10.1

Ubuntu 24.04 LTS
intel-microcode 3.20250512.0ubuntu0.24.04.1

Ubuntu 22.04 LTS
intel-microcode 3.20250512.0ubuntu0.22.04.1

Ubuntu 20.04 LTS
intel-microcode 3.20250512.0ubuntu0.20.04.1

Ubuntu 18.04 LTS
intel-microcode 3.20250512.0ubuntu0.18.04.1+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
intel-microcode 3.20250512.0ubuntu0.16.04.1+esm1
Available with Ubuntu Pro

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7535-1
CVE-2024-28956, CVE-2024-43420, CVE-2024-45332, CVE-2025-20012,
CVE-2025-20054, CVE-2025-20103, CVE-2025-20623, CVE-2025-24495

Package Information:
https://launchpad.net/ubuntu/+source/intel-microcode/3.20250512.0ubuntu0.25.04.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20250512.0ubuntu0.24.10.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20250512.0ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20250512.0ubuntu0.22.04.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20250512.0ubuntu0.20.04.1