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Ubuntu 20.04 LTS: USN-6020-1 Critical Threats in Kernel Security

ubuntu
Calendar Grey April 14, 2023
Scroller Ubuntu
Linux enthusiasts should prioritize addressing USN-6021-2 to patch kernel weaknesses, safeguarding against potential security breaches.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-bluefield: Linux kernel for NVIDIA BlueField platforms

Details:

It was discovered that the System V IPC implementation in the Linux kernel

did not properly handle large shared memory counts. A local attacker could

use this to cause a denial of service (memory exhaustion). (CVE-2021-3669)

It was discovered that the KVM VMX implementation in the Linux kernel did

not properly handle indirect branch prediction isolation between L1 and L2

VMs. An attacker in a guest VM could use this to expose sensitive

information from the host OS or other guest VMs. (CVE-2022-2196)

Gerald Lee discovered that the USB Gadget file system implementation in the

Linux kernel contained a race condition, leading to a use-after-free

vulnerability in some situations. A local attacker could use this to cause

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

(CVE-2022-4382)

It wa...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update arbitrary code execution ubuntu memory exhaustion linux-bluefield

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1060-bluefield  5.4.0-1060.66
   linux-image-bluefield           5.4.0.1060.55

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-6020-1

CVE-2021-3669, CVE-2022-2196, CVE-2022-4382, CVE-2023-23559

Severity
critical
Lowest
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Critical

April 14, 2023

Topics%20covered

Topics Covered

security advisory denial of service kernel update arbitrary code execution ubuntu memory exhaustion linux-bluefield

Package Information

https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1060.66

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