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Ubuntu 20.04 LTS USN-5909-1 Critical: Broadcom USB Driver Threats

ubuntu
Calendar Grey March 2, 2023
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Essential updates for Ubuntu 20.04 LTS that tackle kernel security flaws to maintain system integrity and performance.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems

Details:

It was discovered that the Broadcom FullMAC USB WiFi driver in the Linux

kernel did not properly perform bounds checking in some situations. A

physically proximate attacker could use this to craft a malicious USB

device that when inserted, could cause a denial of service (system crash)

or possibly execute arbitrary code. (CVE-2022-3628)

It was discovered that a use-after-free vulnerability existed in the

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

cause a denial of service (system crash) or possibly execute arbitrary

code. (CVE-2022-3640)

Khalid Masum discovered that the NILFS2 file system implementation in the

Linux kernel did not properly handle certain error conditions, leading to a

use-after-free vulnerability. A local attacker could use this to cause a

denial of servic...

Read the Full Advisory

Topics%20covered

Topics Covered

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

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1103-azure-fde  5.4.0-1103.109+cvm1.1
   linux-image-azure-fde           5.4.0.1103.109+cvm1.36

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-5909-1

CVE-2022-3628, CVE-2022-3640, CVE-2022-3649, CVE-2022-41849,

CVE-2022-41850, CVE-2022-42895, CVE-2023-20928

Severity
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Critical

March 02, 2023

Topics%20covered

Topics Covered

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

Package Information

https://launchpad.net/ubuntu/+source/linux-azure-fde/5.4.0-1103.109+cvm1.1

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