USN-5591-2: Linux kernel (HWE) vulnerability
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Ubuntu Security Notice USN-5591-2
September 01, 2022
linux-aws-hwe vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
Summary:
The system could be made to crash or run programs as an administrator.
Software Description:
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
Details:
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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 ESM:
linux-image-4.15.0-1140-aws-hwe 4.15.0-1140.151~16.04.1
linux-image-aws-hwe 4.15.0.1140.127
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-5591-2
https://ubuntu.com/security/notices/USN-5591-1
CVE-2021-33656
A Linux kernel (HWE) security update has been released for Ubuntu Linux 16.04 ESM.
