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Ubuntu Security Notice USN-4727-1

Ubuntu Security Notice USN-4727-1
Posted Feb 10, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4727-1 - Alexander Popov discovered that multiple race conditions existed in the AF_VSOCK implementation in the Linux kernel. A local attacker could use this to cause a denial of service or execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-26708
MD5 | a8c89d3cda17bd2462a03e3fd24d9971

Ubuntu Security Notice USN-4727-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4727-1
February 10, 2021

linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm,
linux-oem-5.6, linux-oracle, linux-raspi vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS

Summary:

The system could be made to crash or run programs as an administrator.

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-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi (V8) systems
- linux-hwe-5.8: Linux hardware enablement (HWE) kernel
- linux-oem-5.6: Linux kernel for OEM systems

Details:

Alexander Popov discovered that multiple race conditions existed in the
AF_VSOCK implementation in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or execute arbitrary code.

Update instructions:

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

Ubuntu 20.10:
linux-image-5.8.0-1015-raspi 5.8.0-1015.18
linux-image-5.8.0-1015-raspi-nolpae 5.8.0-1015.18
linux-image-5.8.0-1018-kvm 5.8.0-1018.20
linux-image-5.8.0-1020-oracle 5.8.0-1020.21
linux-image-5.8.0-1022-azure 5.8.0-1022.24
linux-image-5.8.0-1022-gcp 5.8.0-1022.23
linux-image-5.8.0-1023-aws 5.8.0-1023.25
linux-image-5.8.0-43-generic 5.8.0-43.49
linux-image-5.8.0-43-generic-64k 5.8.0-43.49
linux-image-5.8.0-43-generic-lpae 5.8.0-43.49
linux-image-5.8.0-43-lowlatency 5.8.0-43.49
linux-image-aws 5.8.0.1023.25
linux-image-azure 5.8.0.1022.22
linux-image-gcp 5.8.0.1022.22
linux-image-generic 5.8.0.43.48
linux-image-generic-64k 5.8.0.43.48
linux-image-generic-lpae 5.8.0.43.48
linux-image-gke 5.8.0.1022.22
linux-image-kvm 5.8.0.1018.20
linux-image-lowlatency 5.8.0.43.48
linux-image-oracle 5.8.0.1020.19
linux-image-raspi 5.8.0.1015.18
linux-image-raspi-nolpae 5.8.0.1015.18
linux-image-virtual 5.8.0.43.48

Ubuntu 20.04 LTS:
linux-image-5.6.0-1047-oem 5.6.0-1047.51
linux-image-5.8.0-43-generic 5.8.0-43.49~20.04.1
linux-image-5.8.0-43-generic-lpae 5.8.0-43.49~20.04.1
linux-image-5.8.0-43-lowlatency 5.8.0-43.49~20.04.1
linux-image-generic-64k-hwe-20.04 5.8.0.43.49~20.04.29
linux-image-generic-hwe-20.04 5.8.0.43.49~20.04.29
linux-image-generic-lpae-hwe-20.04 5.8.0.43.49~20.04.29
linux-image-lowlatency-hwe-20.04 5.8.0.43.49~20.04.29
linux-image-oem-20.04 5.6.0.1047.43
linux-image-virtual-hwe-20.04 5.8.0.43.49~20.04.29

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/4727-1
CVE-2021-26708

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.8.0-43.49
https://launchpad.net/ubuntu/+source/linux-aws/5.8.0-1023.25
https://launchpad.net/ubuntu/+source/linux-azure/5.8.0-1022.24
https://launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1022.23
https://launchpad.net/ubuntu/+source/linux-kvm/5.8.0-1018.20
https://launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1020.21
https://launchpad.net/ubuntu/+source/linux-raspi/5.8.0-1015.18
https://launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-43.49~20.04.1
https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1047.51
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