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Ubuntu 20.04 and 20.10: USN-4910-1 Severe: Kernel Multiple Exploits

ubuntu
Calendar Grey April 13, 2021
Dist Ubuntu Esm H88
Urgent kernel vulnerabilities identified in Ubuntu 20.04 and 20.10 that necessitate prompt updates to improve overall system safety.
Several security issues were fixed in the Linux kernel.

Summary

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel update code execution Ubuntu local exploit race condition kernel ubuntu system crash

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: linux-image-5.8.0-1020-raspi 5.8.0-1020.23 linux-image-5.8.0-1020-raspi-nolpae 5.8.0-1020.23 linux-image-5.8.0-1023-kvm 5.8.0-1023.25 linux-image-5.8.0-1025-oracle 5.8.0-1025.26 linux-image-5.8.0-1027-azure 5.8.0-1027.29 linux-image-5.8.0-1027-gcp 5.8.0-1027.28 linux-image-5.8.0-1028-aws 5.8.0-1028.30 linux-image-5.8.0-49-generic 5.8.0-49.55 linux-image-5.8.0-49-generic-64k 5.8.0-49.55 linux-image-5.8.0-49-generic-lpae 5.8.0-49.55 linux-image-5.8.0-49-lowlatency 5.8.0-49.55 linux-image-aws 5.8.0.1028.30 linux-image-azure 5.8.0.1027.27 linux-image-gcp 5.8.0.1027.27 linux-image-generic 5.8.0.49.54 linux-image-generic-64k 5.8.0.49.54 linux-image-generic-lpae 5.8.0.49.54 linux-image-gke 5.8.0.1027.27 linux-image-kvm 5.8.0.1023.25 linux-image-lowlatency 5.8.0.49.54 linux-image-oem-20.04 5.8.0.49.54 linux-image-oracle 5.8.0.1025.24 linux-image-raspi 5.8.0.1020.23 linux-image-raspi-nolpae 5.8.0.1020.23 linux-image-virtual 5.8.0.49.54 Ubuntu 20.04 LTS: linux-image-5.8.0-49-generic 5.8.0-49.55~20.04.1 linux-image-5.8.0-49-generic-64k 5.8.0-49.55~20.04.1 linux-image-5.8.0-49-generic-lpae 5.8.0-49.55~20.04.1 linux-image-5.8.0-49-lowlatency 5.8.0-49.55~20.04.1 linux-image-generic-64k-hwe-20.04 5.8.0.49.55~20.04.33 linux-image-generic-hwe-20.04 5.8.0.49.55~20.04.33 linux-image-generic-lpae-hwe-20.04 5.8.0.49.55~20.04.33 linux-image-lowlatency-hwe-20.04 5.8.0.49.55~20.04.33 linux-image-virtual-hwe-20.04 5.8.0.49.55~20.04.33 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-4910-1

CVE-2021-20239, CVE-2021-20268, CVE-2021-3178, CVE-2021-3347,

CVE-2021-3348

Severity
critical
Lowest
Low
Medium
High
Critical

April 13, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel update code execution Ubuntu local exploit race condition kernel ubuntu system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/5.8.0-49.55 https://launchpad.net/ubuntu/+source/linux-aws/5.8.0-1028.30 https://launchpad.net/ubuntu/+source/linux-azure/5.8.0-1027.29 https://launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1027.28 https://launchpad.net/ubuntu/+source/linux-kvm/5.8.0-1023.25 https://launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1025.26 https://launchpad.net/ubuntu/+source/linux-raspi/5.8.0-1020.23 https://launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-49.55~20.04.1

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