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Ubuntu 18.04 LTS USN-5591-5 Moderate: linux-aws Security Flaw

ubuntu
Calendar Grey September 2, 2022
Dist Ubuntu Esm H88
Ubuntu's Security Notice USN-5591-4 addresses a serious vulnerability in the linux-aws package that could critically impact system stability and performance. Users should promptly update their AWS instances to mitigate potential risks and ensure their environments are secure and resilient against exploitation efforts related to this issue. Keeping software updated is vital for system stability, particularly in cloud environments like AWS that depend on these important packages.
The system could be made to crash or run programs as an administrator.

Summary

The system could be made to crash or run programs as an administrator.

Software Description:

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

Topics%20covered

Topics Covered

security advisory denial of service ubuntu system crash linux-aws

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1140-aws     4.15.0-1140.151
   linux-image-aws-lts-18.04       4.15.0.1140.140

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-5591-4

https://ubuntu.com/security/notices/USN-5591-1

CVE-2021-33656

September 02, 2022

Topics%20covered

Topics Covered

security advisory denial of service ubuntu system crash linux-aws

Package Information

https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1140.151

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