USN-5071-3: Linux kernel (Raspberry Pi) vulnerabilities
22 September 2021
Several security issues were fixed in the Linux kernel.
Releases
Packages
- 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
-
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
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.