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Ubuntu 20.04 LTS USN-4911-1 Critical: Kernel Denial of Service Issues

ubuntu
Calendar Grey April 13, 2021
Dist Ubuntu Esm H88
A variety of security patches for the Linux kernel in Ubuntu 20.04 LTS tackle significant vulnerabilities. Upgrade your system immediately!
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.10: Linux kernel for OEM systems

Details:

It was discovered that the Nouveau GPU driver in the Linux kernel did not

properly handle error conditions in some situations. A local attacker could

use this to cause a denial of service (system crash). (CVE-2020-25639)

Jan Beulich discovered that the Xen netback backend in the Linux kernel did

not properly handle certain error conditions under paravirtualization. An

attacker in a guest VM could possibly use this to cause a denial of service

(host domain crash). (CVE-2021-28038)

It was discovered that the fastrpc driver in the Linux kernel did not

prevent user space applications from sending kernel RPC messages. A local

attacker could possibly use this to gain elevated privileges.

(CVE-2021-28375)

It was discovered that the fuse user space file system implementation in

the Linux kernel did not properly handle bad inodes in some situations. A

l...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical issue critical Ubuntu kernel fix ubuntu linux-oem-5.10

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.10.0-1021-oem     5.10.0-1021.22
  linux-image-oem-20.04b          5.10.0.1021.22

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-4911-1

CVE-2020-25639, CVE-2021-28038, CVE-2021-28375, CVE-2021-28950

Severity
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Critical

April 13, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical issue critical Ubuntu kernel fix ubuntu linux-oem-5.10

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1021.22

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