USN-5130-1: Linux kernel vulnerabilities
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Ubuntu Security Notice USN-5130-1
November 09, 2021
linux vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- 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 ESM:
linux-image-3.13.0-188-generic 3.13.0-188.239
linux-image-3.13.0-188-lowlatency 3.13.0-188.239
linux-image-generic 3.13.0.188.197
linux-image-lowlatency 3.13.0.188.197
linux-image-server 3.13.0.188.197
linux-image-virtual 3.13.0.188.197
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-5130-1
CVE-2020-29660, CVE-2020-29661
A Linux kernel security update has been released for Ubuntu Linux 14.04 ESM.
