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

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.

Related notices

  • USN-4591-1: linux-image-4.15.0-1100-oem, linux-image-oem-osp1, linux, linux-image-virtual-hwe-16.04, linux-image-lowlatency-hwe-18.04-edge, linux-image-powerpc64-smp, linux-hwe-5.4, linux-image-generic-lpae-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-hwe, linux-image-oem, linux-image-snapdragon-hwe-18.04, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1022-raspi, linux-image-powerpc-smp, linux-image-generic-lpae-hwe-20.04, linux-image-generic-hwe-16.04-edge, linux-image-raspi2-hwe-18.04, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-122-generic-lpae, linux-image-generic-lpae, linux-raspi, linux-image-raspi2, linux-oem, linux-image-raspi-hwe-18.04-edge, linux-image-generic-lpae-hwe-16.04-edge, linux-snapdragon, linux-image-4.15.0-1090-snapdragon, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-52-generic, linux-image-snapdragon, linux-image-powerpc-e500mc, linux-image-powerpc64-emb, linux-image-raspi, linux-image-4.15.0-122-generic, linux-image-5.4.0-52-lowlatency, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-122-lowlatency, linux-image-generic-hwe-18.04, linux-image-5.4.0-52-generic-lpae, linux-image-generic-lpae-hwe-16.04, linux-image-generic-hwe-18.04-edge, linux-image-generic-hwe-16.04, linux-image-lowlatency-hwe-18.04, linux-image-raspi-hwe-18.04, linux-raspi-5.4, linux-image-lowlatency, linux-image-virtual, linux-image-generic, linux-image-virtual-hwe-20.04, linux-image-lowlatency-hwe-16.04-edge, linux-image-virtual-hwe-18.04, linux-image-virtual-hwe-18.04-edge, linux-image-generic-hwe-20.04