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Home > Linux > Ubuntu Linux kernel security update is available

Ubuntu Linux kernel security update is available

Canonical has released a new kernel update for Ubuntu Linux distribution to patch nine different vulnerabilities.


Rusen Gobel Rusen Gobel
January 7, 2022
2 min read
Ubuntu Linux kernel security update is available

Canonical is the company behind the popular Linux distribution Ubuntu. The company now urges users to update their Ubuntu Linux kernels to the latest version. The latest version of the kernel is developed to fix nine different vulnerabilities that might create security risks. Canonical has also shared some details of those flaws.

List of CVE codes

You can find the details of each CVE code affecting different versions of Ubuntu, on the list below.

For all Ubuntu Linux versions:

  • CVE-2021-4002: This flaw allows local attackers to alter data from other processes which use huge pages.
  • CVE-2021-41864: Integer overflow in eBPF implementation allows privileged local attackers to use denial of service or execute arbitrary code.
  • CVE-2021-43389: Race condition in the ISDN CAPI implementation allows privileged local attackers to use denial of service or execute arbitrary code.
  • CVE-2021-43267: A vulnerability in the TIOC Protocol implementation allows privileged local attackers to use denial of service or execute arbitrary code.
  • CVE-2021-20321: Race condition in Linux kernel OverlayFS implementation allows privileged local attackers to use denial of service.
  • CVE-2021-3760: Use-after-free vulnerability in NFC Controller Interface implementation allows local attackers to use denial of service or execute arbitrary code.

For Ubuntu 21.10, Ubuntu 21.04, and Ubuntu 20.04 LTS with Linux kernel 5.11 and Ubuntu 20.04 LTS and Ubuntu 18.04 LTS with Linux kernel 5.4 versions:

  • CVE-2021-43056: Allows KVM guests to crash the host when the host is running on Power8.

For Ubuntu 20.04 LTS and Ubuntu 18.04 LTS with Linux kernel 5.4 versions:

  • CVE-2020-26541: A flaw that allows attackers to bypass UEFI secure boot.

The update also includes a CVE-2021-20317 fix that is a race condition in timer implementation that allows denial-of-service.

  • You may be interested in How to update Linux Kernel without reboot?

How to upgrade Ubuntu Linux Kernel?

The update can be installed and applied via the Software Updater or Terminal command shown below:

sudo apt update && sudo apt dist-upgrade

See more Linux News


Tags: Linux KernelUbuntu
Rusen Gobel

Rusen Gobel

Rusen Gobel is a news editor at Cloud7 News. With more than 10 years of experience, Rusen worked as a hardware and software news editor for technology sites such as Shiftdelete, Teknokolis, Hardware Plus, BT Haber. In addition, Rusen publishes consumer product reviews on his YouTube channel. While consumer electronics has been his main focus for years, now Rusen is more interested in WordPress and software development. He had contributed different web application projects in his professional career. Rusen had graduated from Istanbul University, department of Computer Engineering. Rusen has a very high passion for learning and writing for every kind of technology. That's why he has been working as a tech editor for more than ten years on several different technology magazines and online news portals.

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