USN-5267-3: Linux kernel (Raspberry Pi) vulnerabilities
17 February 2022
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux-raspi - Linux kernel for Raspberry Pi systems
- linux-raspi-5.4 - Linux kernel for Raspberry Pi systems
Details
USN-5267-1 fixed vulnerabilities in the Linux kernel. This update
provides the corresponding updates for the Linux kernel for Raspberry
Pi devices.
Original advisory details:
It was discovered that the Bluetooth subsystem in the Linux kernel
contained a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2021-3640)
Likang Luo discovered that a race condition existed in the Bluetooth
subsystem of the Linux kernel, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-3752)
Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel
did not properly perform bounds checking in some situations. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2021-42739)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04
-
linux-image-5.4.0-1052-raspi
-
5.4.0-1052.58
-
linux-image-raspi
-
5.4.0.1052.86
-
linux-image-raspi2
-
5.4.0.1052.86
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.