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Ubuntu Security Notice USN-4689-4

Ubuntu Security Notice USN-4689-4
Posted Jan 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4689-4 - USN-4689-3 fixed vulnerabilities in the NVIDIA server graphics drivers. This update provides the corresponding updates for the NVIDIA Linux DKMS kernel modules. 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. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2021-1052, CVE-2021-1053, CVE-2021-1056
MD5 | 67b7fedb3c56827c3051283598dae0b9

Ubuntu Security Notice USN-4689-4

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4689-4
January 21, 2021

linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.4, linux-hwe-5.8,
linux-oracle update
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in NVIDIA graphics drivers.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-hwe-5.8: Linux hardware enablement (HWE) kernel
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

Details:

USN-4689-3 fixed vulnerabilities in the NVIDIA server 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:
linux-image-5.8.0-1017-oracle 5.8.0-1017.18
linux-image-5.8.0-1019-azure 5.8.0-1019.21
linux-image-5.8.0-1019-gcp 5.8.0-1019.20
linux-image-5.8.0-1020-aws 5.8.0-1020.22
linux-image-5.8.0-40-generic 5.8.0-40.45
linux-image-5.8.0-40-lowlatency 5.8.0-40.45
linux-image-aws 5.8.0.1020.22
linux-image-azure 5.8.0.1019.19
linux-image-gcp 5.8.0.1019.19
linux-image-generic 5.8.0.40.44
linux-image-gke 5.8.0.1019.19
linux-image-lowlatency 5.8.0.40.44
linux-image-oem-20.04 5.8.0.40.44
linux-image-oracle 5.8.0.1017.17
linux-image-virtual 5.8.0.40.44

Ubuntu 20.04 LTS:
linux-image-5.4.0-64-generic 5.4.0-64.72
linux-image-5.4.0-64-lowlatency 5.4.0-64.72
linux-image-5.8.0-40-generic 5.8.0-40.45~20.04.1
linux-image-5.8.0-40-lowlatency 5.8.0-40.45~20.04.1
linux-image-generic 5.4.0.64.67
linux-image-generic-hwe-20.04 5.8.0.40.45~20.04.25
linux-image-generic-lpae-hwe-20.04 5.8.0.40.45~20.04.25
linux-image-lowlatency 5.4.0.64.67
linux-image-lowlatency-hwe-20.04 5.8.0.40.45~20.04.25
linux-image-oem 5.4.0.64.67
linux-image-oem-osp1 5.4.0.64.67
linux-image-virtual 5.4.0.64.67
linux-image-virtual-hwe-20.04 5.8.0.40.45~20.04.25

Ubuntu 18.04 LTS:
linux-image-4.15.0-134-generic 4.15.0-134.138
linux-image-4.15.0-134-lowlatency 4.15.0-134.138
linux-image-5.4.0-64-generic 5.4.0-64.72~18.04.1
linux-image-5.4.0-64-lowlatency 5.4.0-64.72~18.04.1
linux-image-generic 4.15.0.134.121
linux-image-generic-hwe-18.04 5.4.0.64.72~18.04.59
linux-image-lowlatency 4.15.0.134.121
linux-image-lowlatency-hwe-18.04 5.4.0.64.72~18.04.59
linux-image-oem 5.4.0.64.72~18.04.59
linux-image-oem-osp1 5.4.0.64.72~18.04.59
linux-image-virtual 4.15.0.134.121
linux-image-virtual-hwe-18.04 5.4.0.64.72~18.04.59

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.

References:
https://usn.ubuntu.com/4689-4
https://usn.ubuntu.com/4689-1
CVE-2021-1052, CVE-2021-1053

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.8.0-40.45
https://launchpad.net/ubuntu/+source/linux-aws/5.8.0-1020.22
https://launchpad.net/ubuntu/+source/linux-azure/5.8.0-1019.21
https://launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1019.20
https://launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1017.18
https://launchpad.net/ubuntu/+source/linux/5.4.0-64.72
https://launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-40.45~20.04.1
https://launchpad.net/ubuntu/+source/linux/4.15.0-134.138
https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-64.72~18.04.1
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