========================================================================== 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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