USN-4689-2: Linux kernel vulnerabilities

11 January 2021

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

USN-4689-1 fixed vulnerabilities in the NVIDIA graphics drivers.
This update provides the corresponding updates for the NVIDIA Linux
DKMS kernel modules.

Original advisory details:

It was discovered that the NVIDIA GPU display driver for the Linux kernel
contained a vulnerability that allowed user-mode clients to access legacy
privileged APIs. A local attacker could use this to cause a denial of
service or escalate privileges. (CVE-2021-1052)

It was discovered that the NVIDIA GPU display driver for the Linux kernel
did not properly validate a pointer received from userspace in some
situations. A local attacker could use this to cause a denial of service.
(CVE-2021-1053)

Xinyuan Lyu discovered that the NVIDIA GPU display driver for the Linux
kernel did not properly restrict device-level GPU isolation. A local
attacker could use this to cause a denial of service or possibly expose
sensitive information. (CVE-2021-1056)

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
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-4689-4: linux-image-5.8.0-1019-azure, linux-image-virtual-hwe-20.04, linux-image-aws, linux-image-gke, linux-hwe-5.4, linux-image-generic-lpae-hwe-20.04, linux-image-lowlatency-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-5.8.0-1019-gcp, linux-azure, linux-oracle, linux-aws, linux-image-5.4.0-64-lowlatency, linux-image-generic-hwe-20.04, linux-hwe-5.8, linux-image-4.15.0-134-generic, linux-image-virtual, linux-image-4.15.0-134-lowlatency, linux-image-generic, linux-image-5.8.0-40-generic, linux-image-lowlatency-hwe-20.04, linux-image-generic-hwe-18.04, linux-image-5.8.0-1020-aws, linux-gcp, linux-image-oem-osp1, linux-image-oracle, linux-image-5.4.0-64-generic, linux-image-lowlatency, linux-image-azure, linux-image-oem-20.04, linux-image-oem, linux, linux-image-5.8.0-1017-oracle, linux-image-gcp, linux-image-5.8.0-40-lowlatency
  • USN-4689-3: nvidia-dkms-418-server, nvidia-kernel-source-440-server, nvidia-kernel-source-418-server, nvidia-utils-440-server, nvidia-kernel-source-450-server, nvidia-kernel-common-418-server, nvidia-kernel-common-450-server, nvidia-utils-450-server, xserver-xorg-video-nvidia-440-server, xserver-xorg-video-nvidia-418-server, nvidia-graphics-drivers-418-server, nvidia-dkms-450-server, xserver-xorg-video-nvidia-450-server, nvidia-kernel-common-440-server, nvidia-utils-418-server, nvidia-graphics-drivers-450-server, nvidia-dkms-440-server
  • USN-4689-1: xserver-xorg-video-nvidia-390, xserver-xorg-video-nvidia-455, nvidia-graphics-drivers-390, xserver-xorg-video-nvidia-460, nvidia-graphics-drivers-450, xserver-xorg-video-nvidia-450, xserver-xorg-video-nvidia-440, nvidia-graphics-drivers-460