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[USN-8193-1] libcap vulnerability

Posted on 21 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8193-1
April 21, 2026

libcap2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

libcap could be made to modify capabilities on arbitrary files.

Software Description:
- libcap2: POSIX 1003.1e capabilities library

Details:

Ali Raza discovered that libcap incorrectly handled file capability
updates. A local attacker could possibly use this issue to inject or strip
capabilities into arbitrary executables and escalate privileges.

Update instructions:

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

Ubuntu 25.10
libcap2 1:2.75-7ubuntu2.2
libcap2-bin 1:2.75-7ubuntu2.2

Ubuntu 24.04 LTS
libcap2 1:2.66-5ubuntu2.4
libcap2-bin 1:2.66-5ubuntu2.4

Ubuntu 22.04 LTS
libcap2 1:2.44-1ubuntu0.22.04.3
libcap2-bin 1:2.44-1ubuntu0.22.04.3

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

References:
https://ubuntu.com/security/notices/USN-8193-1
CVE-2026-4878

Package Information:
https://launchpad.net/ubuntu/+source/libcap2/1:2.75-7ubuntu2.2
https://launchpad.net/ubuntu/+source/libcap2/1:2.66-5ubuntu2.4
https://launchpad.net/ubuntu/+source/libcap2/1:2.44-1ubuntu0.22.04.3

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