A libslirp security update has been released for Ubuntu Linux 21.10.

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Ubuntu Security Notice USN-5009-2
October 26, 2021

libslirp vulnerabilities
==========================================================================

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

- Ubuntu 21.10

Summary:

Several security issues were fixed in libslirp.

Software Description:
- libslirp: General purpose TCP-IP emulator library

Details:

USN-5009-1 fixed vulnerabilities in libslirp. This update provides the
corresponding updates for Ubuntu 21.10.

Original advisory details:

Qiuhao Li discovered that libslirp incorrectly handled certain header data
lengths. An attacker inside a guest could possibly use this issue to leak
sensitive information from the host. This issue only affected Ubuntu 20.04
LTS and Ubuntu 20.10. (CVE-2020-29129, CVE-2020-29130)
It was discovered that libslirp incorrectly handled certain udp packets. An
attacker inside a guest could possibly use this issue to leak sensitive
information from the host. (CVE-2021-3592, CVE-2021-3593, CVE-2021-3594,
CVE-2021-3595)

Update instructions:

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

Ubuntu 21.10:
libslirp0 4.4.0-1ubuntu0.21.10.1

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

References:
  https://ubuntu.com/security/notices/USN-5009-2
  https://ubuntu.com/security/notices/USN-5009-1
CVE-2021-3592, CVE-2021-3593, CVE-2021-3594, CVE-2021-3595

Package Information:
  https://launchpad.net/ubuntu/+source/libslirp/4.4.0-1ubuntu0.21.10.1