A virglrenderer security update has been released for Ubuntu 20.04 LTS and 21.10.

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Ubuntu Security Notice USN-5309-1
February 28, 2022

virglrenderer vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in virglrenderer.

Software Description:
- virglrenderer: virtual GPU for KVM virtualization

Details:

It was discovered that virglrenderer incorrectly handled memory. An
attacker inside a guest could use this issue to cause virglrenderer to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2022-0135)

It was discovered that virglrenderer incorrectly initialized memory. An
attacker inside a guest could possibly use this issue to obtain sensitive
host information. (CVE-2022-0175)

Update instructions:

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

Ubuntu 21.10:
libvirglrenderer1 0.8.2-5ubuntu0.21.10.1

Ubuntu 20.04 LTS:
libvirglrenderer1 0.8.2-1ubuntu1.1

After a standard system update you need to restart all virtual machines to
make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5309-1
CVE-2022-0135, CVE-2022-0175

Package Information:
  https://launchpad.net/ubuntu/+source/virglrenderer/0.8.2-5ubuntu0.21.10.1
  https://launchpad.net/ubuntu/+source/virglrenderer/0.8.2-1ubuntu1.1