USN-4592-1: Linux kernel vulnerabilities

20 October 2020

Several security issues were fixed in the Linux kernel.

Releases

Packages

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-4657-1: linux-raspi2, linux-image-raspi2, linux-image-aws, linux-image-generic-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-lts-xenial, linux-image-snapdragon, linux-image-4.4.0-1118-aws, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb, linux-image-4.4.0-1082-aws, linux-image-4.4.0-197-generic, linux-kvm, linux-image-4.4.0-197-powerpc64-emb, linux-image-virtual, linux-image-4.4.0-197-generic-lpae, linux-image-4.4.0-1142-raspi2, linux-image-powerpc-e500mc-lts-xenial, linux-aws, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp, linux-image-4.4.0-197-powerpc64-smp, linux-image-4.4.0-1146-snapdragon, linux-image-generic, linux-image-4.4.0-197-lowlatency, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc-smp, linux-image-powerpc-e500mc, linux-snapdragon, linux, linux-image-4.4.0-1084-kvm, linux-image-4.4.0-197-powerpc-smp, linux-image-lowlatency, linux-image-kvm, linux-image-powerpc64-emb-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-197-powerpc-e500mc, linux-image-generic-lpae
  • USN-4591-1: linux-image-5.4.0-1022-raspi, linux-image-generic-hwe-20.04, linux-image-5.4.0-52-generic-lpae, linux-image-4.15.0-122-generic-lpae, linux-image-raspi2, linux-raspi-5.4, linux-image-oem-osp1, linux-image-snapdragon, linux-image-raspi-hwe-18.04, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-16.04-edge, linux-image-virtual-hwe-18.04-edge, linux-image-virtual-hwe-20.04, linux-hwe-5.4, linux-image-powerpc64-emb, linux-image-4.15.0-122-generic, linux-image-generic-lpae-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04-edge, linux-image-virtual, linux-image-generic-lpae-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04-edge, linux-image-powerpc64-smp, linux-image-raspi2-hwe-18.04, linux-image-4.15.0-1090-snapdragon, linux-oem, linux-image-generic, linux-image-generic-lpae-hwe-20.04, linux-image-virtual-hwe-18.04, linux-image-powerpc-smp, linux-image-5.4.0-52-lowlatency, linux-raspi, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-raspi-hwe-18.04-edge, linux-image-generic-hwe-18.04-edge, linux, linux-image-generic-hwe-16.04, linux-image-generic-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency, linux-image-4.15.0-1100-oem, linux-image-raspi, linux-image-raspi2-hwe-18.04-edge, linux-image-virtual-hwe-16.04, linux-hwe, linux-image-generic-hwe-18.04, linux-image-lowlatency-hwe-20.04, linux-image-oem, linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-52-generic, linux-image-4.15.0-122-lowlatency, linux-image-generic-lpae
  • USN-4752-1: linux-image-5.6.0-1048-oem, linux-oem-5.6, linux-image-oem-20.04