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Ubuntu Security Notice USN-5017-1

Ubuntu Security Notice USN-5017-1
Posted Jul 21, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5017-1 - It was discovered that the virtual file system implementation in the Linux kernel contained an unsigned to signed integer conversion error. A local attacker could use this to cause a denial of service or execute arbitrary code. It was discovered that the bluetooth subsystem in the Linux kernel did not properly perform access control. An authenticated attacker could possibly use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-26558, CVE-2021-33909
MD5 | 0873c6cc3ecce256f668e9fe41464f0e

Ubuntu Security Notice USN-5017-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-5017-1
July 20, 2021

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp,
linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4,
linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi,
linux-raspi-5.4 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

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-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi (V8) systems
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi (V8) systems

Details:

It was discovered that the virtual file system implementation in the Linux
kernel contained an unsigned to signed integer conversion error. A local
attacker could use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2021-33909)

It was discovered that the bluetooth subsystem in the Linux kernel did not
properly perform access control. An authenticated attacker could possibly
use this to expose sensitive information. (CVE-2020-26558, CVE-2021-0129)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1021-gkeop 5.4.0-1021.22
linux-image-5.4.0-1041-raspi 5.4.0-1041.45
linux-image-5.4.0-1044-kvm 5.4.0-1044.46
linux-image-5.4.0-1049-gcp 5.4.0-1049.53
linux-image-5.4.0-1049-gke 5.4.0-1049.52
linux-image-5.4.0-1052-oracle 5.4.0-1052.56
linux-image-5.4.0-1054-aws 5.4.0-1054.57
linux-image-5.4.0-1055-azure 5.4.0-1055.57
linux-image-5.4.0-80-generic 5.4.0-80.90
linux-image-5.4.0-80-generic-lpae 5.4.0-80.90
linux-image-5.4.0-80-lowlatency 5.4.0-80.90
linux-image-aws-lts-20.04 5.4.0.1054.57
linux-image-azure-lts-20.04 5.4.0.1055.53
linux-image-gcp-lts-20.04 5.4.0.1049.59
linux-image-generic 5.4.0.80.84
linux-image-generic-lpae 5.4.0.80.84
linux-image-gke 5.4.0.1049.59
linux-image-gke-5.4 5.4.0.1049.59
linux-image-gkeop 5.4.0.1021.24
linux-image-gkeop-5.4 5.4.0.1021.24
linux-image-kvm 5.4.0.1044.43
linux-image-lowlatency 5.4.0.80.84
linux-image-oem 5.4.0.80.84
linux-image-oem-osp1 5.4.0.80.84
linux-image-oracle-lts-20.04 5.4.0.1052.52
linux-image-raspi 5.4.0.1041.76
linux-image-raspi2 5.4.0.1041.76
linux-image-virtual 5.4.0.80.84

Ubuntu 18.04 LTS:
linux-image-5.4.0-1021-gkeop 5.4.0-1021.22~18.04.1
linux-image-5.4.0-1041-raspi 5.4.0-1041.45~18.04.1
linux-image-5.4.0-1049-gcp 5.4.0-1049.53~18.04.1
linux-image-5.4.0-1049-gke 5.4.0-1049.52~18.04.1
linux-image-5.4.0-1052-oracle 5.4.0-1052.56~18.04.1
linux-image-5.4.0-1054-aws 5.4.0-1054.57~18.04.1
linux-image-5.4.0-1055-azure 5.4.0-1055.57~18.04.1
linux-image-5.4.0-80-generic 5.4.0-80.90~18.04.1
linux-image-5.4.0-80-generic-lpae 5.4.0-80.90~18.04.1
linux-image-5.4.0-80-lowlatency 5.4.0-80.90~18.04.1
linux-image-aws 5.4.0.1054.37
linux-image-azure 5.4.0.1055.35
linux-image-gcp 5.4.0.1049.36
linux-image-generic-hwe-18.04 5.4.0.80.90~18.04.72
linux-image-generic-lpae-hwe-18.04 5.4.0.80.90~18.04.72
linux-image-gke-5.4 5.4.0.1049.52~18.04.15
linux-image-gkeop-5.4 5.4.0.1021.22~18.04.22
linux-image-lowlatency-hwe-18.04 5.4.0.80.90~18.04.72
linux-image-oem 5.4.0.80.90~18.04.72
linux-image-oem-osp1 5.4.0.80.90~18.04.72
linux-image-oracle 5.4.0.1052.56~18.04.32
linux-image-raspi-hwe-18.04 5.4.0.1041.44
linux-image-snapdragon-hwe-18.04 5.4.0.80.90~18.04.72
linux-image-virtual-hwe-18.04 5.4.0.80.90~18.04.72

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://ubuntu.com/security/notices/USN-5017-1
CVE-2020-26558, CVE-2021-0129, CVE-2021-33909

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.4.0-80.90
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1054.57
https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1055.57
https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1049.53
https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1049.52
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1021.22
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1044.46
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1052.56
https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1041.45
https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1054.57~18.04.1
https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1055.57~18.04.1
https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1049.53~18.04.1
https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1049.52~18.04.1
https://launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1021.22~18.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-80.90~18.04.1
https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1052.56~18.04.1
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1041.45~18.04.1
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