USN-8550-1: libslirp vulnerability

Publication date

15 July 2026

Overview

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


Packages

  • 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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.04 LTS resolute libslirp0 –  4.9.1-1ubuntu1.1
24.04 LTS noble libslirp0 –  4.7.0-1ubuntu3.1
22.04 LTS jammy libslirp0 –  4.6.1-1ubuntu0.2

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