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[USN-8550-1] libslirp vulnerability

Posted on 15 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8550-1
July 15, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

libslirp could be made to expose sensitive information over the network.

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

Details:

It was discovered that libslirp incorrectly handled TCP urgent data. A
privileged attacker inside a guest VM could possibly use this issue to
obtain sensitive information from the host process memory.

Update instructions:

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

Ubuntu 26.04 LTS
libslirp0 4.9.1-1ubuntu1.1

Ubuntu 24.04 LTS
libslirp0 4.7.0-1ubuntu3.1

Ubuntu 22.04 LTS
libslirp0 4.6.1-1ubuntu0.2

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

References:
https://ubuntu.com/security/notices/USN-8550-1
CVE-2026-9539

Package Information:
https://launchpad.net/ubuntu/+source/libslirp/4.9.1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/libslirp/4.7.0-1ubuntu3.1
https://launchpad.net/ubuntu/+source/libslirp/4.6.1-1ubuntu0.2

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