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Ubuntu Security Notice USN-5071-3

Ubuntu Security Notice USN-5071-3
Posted Sep 22, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5071-3 - It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. An attacker who could start and control a VM could possibly use this to expose sensitive information or execute arbitrary code. Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly validate data passed via an ioctl. A local attacker could use this to cause a denial of service or possibly execute arbitrary code on systems with a joystick device registered. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-22543, CVE-2021-3612
SHA-256 | 63399d9c49059cdc5bb64c4bf9375adf331d0157df9b1c540a9a4d22a0397474

Ubuntu Security Notice USN-5071-3

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5071-3
September 22, 2021

linux-raspi, linux-raspi-5.4 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-raspi: Linux kernel for Raspberry Pi (V8) systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi (V8) systems

Details:

It was discovered that the KVM hypervisor implementation in the Linux
kernel did not properly perform reference counting in some situations,
leading to a use-after-free vulnerability. An attacker who could start and
control a VM could possibly use this to expose sensitive information or
execute arbitrary code. (CVE-2021-22543)

Murray McAllister discovered that the joystick device interface in the
Linux kernel did not properly validate data passed via an ioctl(). A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code on systems with a joystick device
registered. (CVE-2021-3612)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1043-raspi 5.4.0-1043.47
linux-image-raspi 5.4.0.1043.78
linux-image-raspi2 5.4.0.1043.78

Ubuntu 18.04 LTS:
linux-image-5.4.0-1043-raspi 5.4.0-1043.47~18.04.1
linux-image-raspi-hwe-18.04 5.4.0.1043.46

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-5071-3
https://ubuntu.com/security/notices/USN-5071-1
CVE-2021-22543, CVE-2021-3612

Package Information:
https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1043.47
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1043.47~18.04.1

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