[USN-5485-2] Linux kernel (OEM) vulnerabilities


========================================================================== Ubuntu Security Notice USN-5485-2 July 01, 2022
linux-oem-5.14 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.04 LTS
Summary:
Several security issues were mitigated in the Linux kernel.
Software Description: – 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 LTS: linux-image-5.14.0-1044-oem 5.14.0-1044.49 linux-image-oem-20.04 5.14.0.1044.40 linux-image-oem-20.04b 5.14.0.1044.40 linux-image-oem-20.04c 5.14.0.1044.40 linux-image-oem-20.04d 5.14.0.1044.40
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.
References: ubuntu.com/security/notices/USN-5485-2 ubuntu.com/security/notices/USN-5485-1 CVE-2022-21123, CVE-2022-21125, CVE-2022-21166
Package Information: launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1044.49