USN-5485-2: Linux kernel (OEM) vulnerabilities
1 July 2022
Several security issues were mitigated in the Linux kernel.
Releases
Packages
- linux-oem-5.14 - Linux kernel for OEM systems
Details
It was discovered that some Intel processors did not completely perform
cleanup actions on multi-core shared buffers. A local attacker could
possibly use this to expose sensitive information. (CVE-2022-21123)
It was discovered that some Intel processors did not completely perform
cleanup actions on microarchitectural fill buffers. A local attacker could
possibly use this to expose sensitive information. (CVE-2022-21125)
It was discovered that some Intel processors did not properly perform
cleanup during specific special register write operations. A local attacker
could possibly use this to expose sensitive information. (CVE-2022-21166)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04
-
linux-image-oem-20.04c
-
5.14.0.1044.40
-
linux-image-oem-20.04b
-
5.14.0.1044.40
-
linux-image-oem-20.04d
-
5.14.0.1044.40
-
linux-image-oem-20.04
-
5.14.0.1044.40
-
linux-image-5.14.0-1044-oem
-
5.14.0-1044.49
Please note that fully mitigating processor vulnerabilities requires
corresponding processor microcode/firmware updates.
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.