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Ubuntu 16.04 and 14.04 USN-6221-1 Critical: Kernel Flaws Causing DoS

ubuntu
Calendar Grey July 12, 2023
Dist Ubuntu Esm H88
Important patches released addressing various vulnerabilities within the Ubuntu Linux kernel. Prioritize your safety and stay educated!
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-kvm: Linux kernel for cloud environments

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

It was discovered that a race condition existed in the overlay file system

implementation in the Linux kernel. A local attacker could use this to

cause a denial of service (system crash). (CVE-2021-20321)

It was discovered that the virtual terminal (vt) device implementation in

the Linux kernel contained a race condition in its ioctl handling that led

to an out-of-bounds read vulnerability. A local attacker could possibly use

this to expose sensitive information. (CVE-2021-3753)

It was discovered that the ext4 file system implementation in the Linux

kernel contained a use-after-free vulnerability. An attacker could use this

to construct a malicious ext4 file syst...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update race condition ubuntu system crash

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1121-kvm      4.4.0-1121.131
   linux-image-4.4.0-1158-aws      4.4.0-1158.173
   linux-image-4.4.0-242-generic   4.4.0-242.276
   linux-image-4.4.0-242-lowlatency  4.4.0-242.276
   linux-image-aws                 4.4.0.1158.162
   linux-image-generic             4.4.0.242.248
   linux-image-generic-lts-xenial  4.4.0.242.248
   linux-image-kvm                 4.4.0.1121.118
   linux-image-lowlatency          4.4.0.242.248
   linux-image-lowlatency-lts-xenial  4.4.0.242.248
   linux-image-virtual             4.4.0.242.248
   linux-image-virtual-lts-xenial  4.4.0.242.248

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1120-aws      4.4.0-1120.126
   linux-image-4.4.0-242-generic   4.4.0-242.276~14.04.1
   linux-image-4.4.0-242-lowlatency  4.4.0-242.276~14.04.1
   linux-image-aws                 4.4.0.1120.117
   linux-image-generic-lts-xenial  4.4.0.242.210
   linux-image-lowlatency-lts-xenial  4.4.0.242.210
   linux-image-virtual-lts-xenial  4.4.0.242.210

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-6221-1

CVE-2021-20321, CVE-2021-3753, CVE-2022-1184, CVE-2022-26373,

CVE-2022-29901, CVE-2023-1990, CVE-2023-3111

Severity
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July 12, 2023

Topics%20covered

Topics Covered

security advisory denial of service kernel update race condition ubuntu system crash

Package Information

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