USN-4592-1: Linux kernel vulnerabilities
20 October 2020
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux-oem-osp1 - Linux kernel for OEM systems
- linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V8) systems
Details
Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux
kernel contained a type-confusion error. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-12351)
Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux
kernel did not properly initialize memory in some situations. A physically
proximate remote attacker could use this to expose sensitive information
(kernel memory). (CVE-2020-12352)
Andy Nguyen discovered that the Bluetooth HCI event packet parser in the
Linux kernel did not properly handle event advertisements of certain sizes,
leading to a heap-based buffer overflow. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-24490)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
linux-image-5.0.0-1070-oem-osp1
-
5.0.0-1070.76
-
linux-image-5.3.0-1036-raspi2
-
5.3.0-1036.38
-
linux-image-oem-osp1
-
5.0.0.1070.68
-
linux-image-raspi2-hwe-18.04
-
5.3.0.1036.25
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.