A zlib security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 21.10.

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Ubuntu Security Notice USN-5355-1
March 30, 2022

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

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

zlib could be made to crash or run programs if it received specially
crafted input.

Software Description:
- zlib: Lossless data-compression library

Details:

Danilo Ramos discovered that zlib incorrectly handled memory when
performing certain deflating operations. An attacker could use this issue
to cause zlib 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 21.10:
lib32z1 1:1.2.11.dfsg-2ubuntu7.1
lib64z1 1:1.2.11.dfsg-2ubuntu7.1
libx32z1 1:1.2.11.dfsg-2ubuntu7.1
zlib1g 1:1.2.11.dfsg-2ubuntu7.1

Ubuntu 20.04 LTS:
lib32z1 1:1.2.11.dfsg-2ubuntu1.3
lib64z1 1:1.2.11.dfsg-2ubuntu1.3
libx32z1 1:1.2.11.dfsg-2ubuntu1.3
zlib1g 1:1.2.11.dfsg-2ubuntu1.3

Ubuntu 18.04 LTS:
lib32z1 1:1.2.11.dfsg-0ubuntu2.1
lib64z1 1:1.2.11.dfsg-0ubuntu2.1
libx32z1 1:1.2.11.dfsg-0ubuntu2.1
zlib1g 1:1.2.11.dfsg-0ubuntu2.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5355-1
CVE-2018-25032

Package Information:
  https://launchpad.net/ubuntu/+source/zlib/1:1.2.11.dfsg-2ubuntu7.1
  https://launchpad.net/ubuntu/+source/zlib/1:1.2.11.dfsg-2ubuntu1.3
  https://launchpad.net/ubuntu/+source/zlib/1:1.2.11.dfsg-0ubuntu2.1