USN-4591-1: Linux kernel vulnerabilities

19 October 2020

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
  • linux-oem - Linux kernel for OEM systems
  • linux-raspi - Linux kernel for Raspberry Pi (V8) systems
  • linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

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)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04
  • linux-image-5.4.0-1022-raspi - 5.4.0-1022.25
  • linux-image-5.4.0-52-generic - 5.4.0-52.57
  • linux-image-5.4.0-52-generic-lpae - 5.4.0-52.57
  • linux-image-5.4.0-52-lowlatency - 5.4.0-52.57
  • linux-image-generic - 5.4.0.52.55
  • linux-image-generic-hwe-18.04 - 5.4.0.52.55
  • linux-image-generic-hwe-18.04-edge - 5.4.0.52.55
  • linux-image-generic-hwe-20.04 - 5.4.0.52.55
  • linux-image-generic-lpae - 5.4.0.52.55
  • linux-image-generic-lpae-hwe-18.04 - 5.4.0.52.55
  • linux-image-generic-lpae-hwe-18.04-edge - 5.4.0.52.55
  • linux-image-generic-lpae-hwe-20.04 - 5.4.0.52.55
  • linux-image-lowlatency - 5.4.0.52.55
  • linux-image-lowlatency-hwe-18.04 - 5.4.0.52.55
  • linux-image-lowlatency-hwe-18.04-edge - 5.4.0.52.55
  • linux-image-lowlatency-hwe-20.04 - 5.4.0.52.55
  • linux-image-oem - 5.4.0.52.55
  • linux-image-oem-osp1 - 5.4.0.52.55
  • linux-image-raspi - 5.4.0.1022.57
  • linux-image-raspi-hwe-18.04 - 5.4.0.1022.57
  • linux-image-raspi-hwe-18.04-edge - 5.4.0.1022.57
  • linux-image-raspi2 - 5.4.0.1022.57
  • linux-image-raspi2-hwe-18.04 - 5.4.0.1022.57
  • linux-image-raspi2-hwe-18.04-edge - 5.4.0.1022.57
  • linux-image-virtual - 5.4.0.52.55
  • linux-image-virtual-hwe-18.04 - 5.4.0.52.55
  • linux-image-virtual-hwe-18.04-edge - 5.4.0.52.55
  • linux-image-virtual-hwe-20.04 - 5.4.0.52.55
Ubuntu 18.04
Ubuntu 16.04

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-4592-1: linux-image-raspi2-hwe-18.04, linux-image-5.3.0-1036-raspi2, linux-image-oem-osp1, linux-image-5.0.0-1070-oem-osp1, linux-raspi2-5.3, linux-oem-osp1