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Ubuntu 16.04 ESM USN-5652-1 Critical: Linux Kernel Azure DoS

ubuntu
Calendar Grey October 3, 2022
Dist Ubuntu Esm H88
Multiple vulnerabilities within the Linux kernel for Ubuntu Azure have been addressed, enhancing both system performance and security integrity.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

It was discovered that the framebuffer driver on the Linux kernel did not

verify size limits when changing font or screen size, 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. (CVE-2021-33655)

Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter

subsystem in the Linux kernel did not properly handle rules that truncated

packets below the packet header size. When such rules are in place, a

remote attacker could possibly use this to cause a denial of service

(system crash). (CVE-2022-36946)

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical system stability ubuntu linux-azure

Update Instructions

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

Ubuntu 16.04 ESM:
   linux-image-4.15.0-1151-azure   4.15.0-1151.166~16.04.1
   linux-image-azure               4.15.0.1151.138

Ubuntu 14.04 ESM:
   linux-image-4.15.0-1151-azure   4.15.0-1151.166~14.04.1
   linux-image-azure               4.15.0.1151.120

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-5652-1

CVE-2021-33655, CVE-2022-36946

Severity
critical
Lowest
Low
Medium
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Critical

October 03, 2022

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical system stability ubuntu linux-azure

Package Information

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