Ubuntu Security Notice 6244-1 - Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain vector register instructions. A local attacker could use this to expose sensitive information.
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Ubuntu Security Notice USN-6244-1
July 25, 2023
amd64-microcode vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
Summary:
AMD processors may allow an attacker to expose sensitive information due
to a vector register speculative execution vulnerability.
Software Description:
- amd64-microcode: Processor microcode firmware for AMD CPUs
Details:
Tavis Ormandy discovered that some AMD processors did not properly
handle speculative execution of certain vector register instructions. A
local attacker could use this to expose sensitive information.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 23.04:
amd64-microcode 3.20220411.1ubuntu3.1
Ubuntu 22.04 LTS:
amd64-microcode 3.20191218.1ubuntu2.1
Ubuntu 20.04 LTS:
amd64-microcode 3.20191218.1ubuntu1.1
Ubuntu 18.04 LTS (Available with Ubuntu Pro):
amd64-microcode 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm1
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
amd64-microcode 3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm1
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6244-1
CVE-2023-20593
Package Information:
https://launchpad.net/ubuntu/+source/amd64-microcode/3.20220411.1ubuntu3.1
https://launchpad.net/ubuntu/+source/amd64-microcode/3.20191218.1ubuntu2.1
https://launchpad.net/ubuntu/+source/amd64-microcode/3.20191218.1ubuntu1.1