USN-6967-1: Intel Microcode vulnerabilities

USN-6967-1: Intel Microcode vulnerabilities

Several security issues were fixed in Intel Microcode.

Releases
Ubuntu 24.04 LTS Ubuntu 22.04 LTS Ubuntu 20.04 LTS Ubuntu 18.04 ESM Ubuntu 16.04 ESM

Packages
intel-microcode - Processor microcode for Intel CPUs

Details
It was discovered that some Intel® Core™ Ultra Processors did not properly
isolate the stream cache. A local authenticated user could potentially use
this to escalate their privileges. (CVE-2023-42667)

It was discovered that some Intel® Processors did not properly isolate the
stream cache. A local authenticated user could potentially use this to
escalate their privileges. (CVE-2023-49141)

It was discovered that some Intel® Processors did not correctly transition
between the executive monitor and SMI transfer monitor (STM). A privileged
local attacker could use this to escalate their privileges.
(CVE-2024-24853)

It was discovered that some 3rd, 4th, and 5th Generation Intel® Xeon®
Processors failed to properly implement a protection mechanism. A local
attacker could use this to potentially escalate their privileges.
(CVE-2024-24980)

It was discovered that some 3rd Generation Intel Xeon Scalable Processors
did not properly handle mirrored regions with different values. A
privileged local user could use this to cause a denial of service (system
crash). (CVE-2024-25939)

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

Ubuntu 24.04
intel-microcode - 3.20240813.0ubuntu0.24.04.2

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