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Ubuntu 21.04 USN-4997-2: Critical KVM Kernel Issues and DoS Risks

ubuntu
Calendar Grey June 25, 2021
Dist Ubuntu Esm H88
Ubuntu 21.10 is provided with essential patches addressing several kernel flaws impacting system integrity and functionality.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-kvm: Linux kernel for cloud environments

Details:

USN-4997-1 fixed vulnerabilities in the Linux kernel for Ubuntu 21.04.

This update provides the corresponding updates for the Linux KVM

kernel for Ubuntu 21.04.

Norbert Slusarek discovered a race condition in the CAN BCM networking

protocol of the Linux kernel leading to multiple use-after-free

vulnerabilities. A local attacker could use this issue to execute arbitrary

code. (CVE-2021-3609)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel

did not properly enforce limits for pointer operations. A local attacker

could use this to cause a denial of service (system crash) or possibly

execute arbitrary code. (CVE-2021-33200)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did

not properly clear received fragments from memory in some situations. A

physically proximate attacker ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu critical issues linux-kvm cloud environment

Update Instructions

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

Ubuntu 21.04:
  linux-image-5.11.0-1009-kvm     5.11.0-1009.9
  linux-image-kvm                 5.11.0.1009.9

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-4997-2

https://ubuntu.com/security/notices/USN-4997-1

CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139,

CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133,

CVE-2021-23134, CVE-2021-31440, CVE-2021-31829, CVE-2021-32399,

CVE-2021-33034, CVE-2021-33200, CVE-2021-3506, CVE-2021-3543,

CVE-2021-3609

Severity
critical
Lowest
Low
Medium
High
Critical

June 25, 2021

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu critical issues linux-kvm cloud environment

Package Information

https://launchpad.net/ubuntu/+source/linux-kvm/5.11.0-1009.9

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