A Linux security update has been released for Ubuntu Linux 20.04 LTS.

USN-5416-1: Linux kernel (OEM) vulnerabilities

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Ubuntu Security Notice USN-5416-1
May 12, 2022

linux-oem-5.14 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-oem-5.14: Linux kernel for OEM systems

Details:

Qiuhao Li, Gaoning Pan and Yongkang Jia discovered that the KVM
implementation in the Linux kernel did not properly perform guest page
table updates in some situations. An attacker in a guest vm could possibly
use this to crash the host OS. (CVE-2022-1158)

It was discovered that the implementation of X.25 network protocols in
the Linux kernel did not terminate link layer sessions properly. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2022-1516)

It was discovered that the 8 Devices USB2CAN interface implementation
in the Linux kernel did not properly handle certain error conditions,
leading to a double-free. A local attacker could possibly use this to
cause a denial of service (system crash). (CVE-2022-28388)

It was discovered that the Microchip CAN BUS Analyzer interface
implementation in the Linux kernel did not properly handle certain error
conditions, leading to a double-free. A local attacker could possibly
use this to cause a denial of service (system crash). (CVE-2022-28389)

It was discovered that the EMS CAN/USB interface implementation in the
Linux kernel contained a double-free vulnerability when handling certain
error conditions. A local attacker could use this to cause a denial of
service (memory exhaustion). (CVE-2022-28390)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.14.0-1036-oem 5.14.0-1036.40
linux-image-oem-20.04 5.14.0.1036.33
linux-image-oem-20.04b 5.14.0.1036.33
linux-image-oem-20.04c 5.14.0.1036.33
linux-image-oem-20.04d 5.14.0.1036.33

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:
  https://ubuntu.com/security/notices/USN-5416-1
CVE-2022-1158, CVE-2022-1516, CVE-2022-28388, CVE-2022-28389,
CVE-2022-28390

Package Information:
  https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1036.40