USN-4710-1: Linux kernel vulnerability
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Ubuntu Security Notice USN-4710-1
January 28, 2021
linux vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
Summary:
The system could be made to crash under certain conditions.
Software Description:
- linux: Linux kernel
Details:
Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did
not properly deallocate memory in some situations. A privileged attacker
could use this to cause a denial of service (kernel memory exhaustion).
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
linux-image-4.15.0-135-generic 4.15.0-135.139
linux-image-4.15.0-135-generic-lpae 4.15.0-135.139
linux-image-4.15.0-135-lowlatency 4.15.0-135.139
linux-image-generic 4.15.0.135.122
linux-image-generic-lpae 4.15.0.135.122
linux-image-lowlatency 4.15.0.135.122
linux-image-powerpc-e500mc 4.15.0.135.122
linux-image-powerpc-smp 4.15.0.135.122
linux-image-powerpc64-emb 4.15.0.135.122
linux-image-powerpc64-smp 4.15.0.135.122
linux-image-virtual 4.15.0.135.122
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://usn.ubuntu.com/4710-1
CVE-2020-25704
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-135.139
A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS to address an issue with the perf subsystem.
