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Ubuntu 18.04 LTS: USN-5600-1 Critical Linux Kernel HWE Flaws

ubuntu
Calendar Grey September 5, 2022
Dist Ubuntu Esm H88
A variety of security flaws have been addressed in the Linux operating system for Ubuntu 18.04 LTS, necessitating important patches.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

Details:

Asaf Modelevsky discovered that the Intel(R) 10GbE PCI Express (ixgbe)

Ethernet driver for the Linux kernel performed insufficient control flow

management. A local attacker could possibly use this to cause a denial

of service. (CVE-2021-33061)

It was discovered that the virtual terminal driver in the Linux kernel

did not properly handle VGA console font changes, leading to an

out-of-bounds write. A local attacker could use this to cause a denial

of service (system crash) or possibly execute arbitrary code.

(CVE-2021-33656)

Topics%20covered

Topics Covered

security advisory denial of service update critical ubuntu linux kernel hwe

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-5.4.0-125-generic   5.4.0-125.141~18.04.1
   linux-image-5.4.0-125-generic-lpae  5.4.0-125.141~18.04.1
   linux-image-5.4.0-125-lowlatency  5.4.0-125.141~18.04.1
   linux-image-generic-hwe-18.04   5.4.0.125.141~18.04.105
   linux-image-generic-lpae-hwe-18.04  5.4.0.125.141~18.04.105
   linux-image-lowlatency-hwe-18.04  5.4.0.125.141~18.04.105
   linux-image-oem                 5.4.0.125.141~18.04.105
   linux-image-oem-osp1            5.4.0.125.141~18.04.105
   linux-image-snapdragon-hwe-18.04  5.4.0.125.141~18.04.105
   linux-image-virtual-hwe-18.04   5.4.0.125.141~18.04.105

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-5600-1

CVE-2021-33061, CVE-2021-33656

Severity
critical
Lowest
Low
Medium
High
Critical

September 05, 2022

Topics%20covered

Topics Covered

security advisory denial of service update critical ubuntu linux kernel hwe

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-125.141~18.04.1

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