An Open vSwitch security update has been released for Ubuntu Linux 20.04 LTS and 21.04.

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Ubuntu Security Notice USN-5065-1
September 08, 2021

openvswitch vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.04 LTS

Summary:

Open vSwitch could be made to crash or run programs if it received
specially crafted network traffic.

Software Description:
- openvswitch: Ethernet virtual switch

Details:

It was discovered that Open vSwitch incorrectly handled decoding RAW_ENCAP
actions. A remote attacker could use this issue to cause Open vSwitch to
crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions:

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

Ubuntu 21.04:
openvswitch-common 2.15.0-0ubuntu3.1

Ubuntu 20.04 LTS:
openvswitch-common 2.13.3-0ubuntu0.20.04.2

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5065-1
CVE-2021-36980

Package Information:
  https://launchpad.net/ubuntu/+source/openvswitch/2.15.0-0ubuntu3.1
  https://launchpad.net/ubuntu/+source/openvswitch/2.13.3-0ubuntu0.20.04.2