USN-5595-1: Linux kernel vulnerabilities
2 September 2022
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
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)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
linux-image-azure
-
5.4.0.1090.67
-
linux-image-5.4.0-1084-aws
-
5.4.0-1084.91~18.04.1
-
linux-image-aws
-
5.4.0.1084.64
-
linux-image-5.4.0-1090-azure
-
5.4.0-1090.95~18.04.1
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.