Ubuntu 20.04 LTS Advisory USN-5874-1 Critical: Kernel Security Risks

ubuntu

February 15, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-ibm: Linux kernel for IBM cloud systems

- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems

- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

- linux-ibm-5.4: Linux kernel for IBM cloud systems

- linux-oracle-5.4: Linux kernel for Oracle 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 coul...

Read the Full Advisory

Topics Covered

security advisory Ubuntu kernel Denial of Service system crash use-after-free cloud systems

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1044-ibm      5.4.0-1044.49
   linux-image-5.4.0-1100-gcp      5.4.0-1100.109
   linux-image-gcp-lts-20.04       5.4.0.1100.102
   linux-image-ibm                 5.4.0.1044.70
   linux-image-ibm-lts-20.04       5.4.0.1044.70

Ubuntu 18.04 LTS:
   linux-image-5.4.0-1044-ibm      5.4.0-1044.49~18.04.1
   linux-image-5.4.0-1093-oracle   5.4.0-1093.102~18.04.1
   linux-image-5.4.0-1096-aws      5.4.0-1096.104~18.04.1
   linux-image-5.4.0-1100-gcp      5.4.0-1100.109~18.04.1
   linux-image-5.4.0-139-generic   5.4.0-139.156~18.04.1
   linux-image-5.4.0-139-generic-lpae  5.4.0-139.156~18.04.1
   linux-image-5.4.0-139-lowlatency  5.4.0-139.156~18.04.1
   linux-image-aws                 5.4.0.1096.74
   linux-image-gcp                 5.4.0.1100.76
   linux-image-generic-hwe-18.04   5.4.0.139.156~18.04.114
   linux-image-generic-lpae-hwe-18.04  5.4.0.139.156~18.04.114
   linux-image-ibm                 5.4.0.1044.55
   linux-image-lowlatency-hwe-18.04  5.4.0.139.156~18.04.114
   linux-image-oem                 5.4.0.139.156~18.04.114
   linux-image-oem-osp1            5.4.0.139.156~18.04.114
   linux-image-oracle              5.4.0.1093.102~18.04.67
   linux-image-snapdragon-hwe-18.04  5.4.0.139.156~18.04.114
   linux-image-virtual-hwe-18.04   5.4.0.139.156~18.04.114

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.