USN-5130-1: Linux kernel vulnerabilities
9 November 2021
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux - Linux kernel
Details
Jann Horn discovered a race condition in the tty subsystem of the Linux
kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-
free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)
Jann Horn discovered that the tty subsystem of the Linux kernel did not use
consistent locking in some situations, leading to a read-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information (kernel memory).
(CVE-2020-29660)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 14.04
-
linux-image-3.13.0-188-generic
-
3.13.0-188.239
Available with Ubuntu Pro
-
linux-image-3.13.0-188-lowlatency
-
3.13.0-188.239
Available with Ubuntu Pro
-
linux-image-generic
-
3.13.0.188.197
Available with Ubuntu Pro
-
linux-image-lowlatency
-
3.13.0.188.197
Available with Ubuntu Pro
-
linux-image-server
-
3.13.0.188.197
Available with Ubuntu Pro
-
linux-image-virtual
-
3.13.0.188.197
Available with Ubuntu Pro
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.