[USN-5267-3] Linux kernel (Raspberry Pi) vulnerabilities

========================================================================== Ubuntu Security Notice USN-5267-3 February 17, 2022
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 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 LTS: 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 LTS: linux-image-5.4.0-1052-raspi 5.4.0-1052.58~18.04.1 linux-image-raspi-hwe-18.04 5.4.0.1052.54
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-5267-3 ubuntu.com/security/notices/USN-5267-1 CVE-2021-3640, CVE-2021-3752, CVE-2021-42739
Package Information: launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1052.58 launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1052.58~18.04.1