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[USN-8193-2] libcap vulnerability

Posted on 23 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8193-2
June 23, 2026

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

libcap could be made to modify capabilities on arbitrary files.

Software Description:
- libcap2: POSIX 1003.1e capabilities library

Details:

USN-8193-1 fixed a vulnerability in libcap. This update provides the
corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS,
Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory 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 20.04 LTS
libcap-dev 1:2.32-1ubuntu0.2+esm1
Available with Ubuntu Pro
libcap2 1:2.32-1ubuntu0.2+esm1
Available with Ubuntu Pro
libcap2-bin 1:2.32-1ubuntu0.2+esm1
Available with Ubuntu Pro
libpam-cap 1:2.32-1ubuntu0.2+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libcap-dev 1:2.25-1.2ubuntu0.1~esm2
Available with Ubuntu Pro
libcap2 1:2.25-1.2ubuntu0.1~esm2
Available with Ubuntu Pro
libcap2-bin 1:2.25-1.2ubuntu0.1~esm2
Available with Ubuntu Pro
libpam-cap 1:2.25-1.2ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libcap-dev 1:2.24-12ubuntu0.1~esm2
Available with Ubuntu Pro
libcap2 1:2.24-12ubuntu0.1~esm2
Available with Ubuntu Pro
libcap2-bin 1:2.24-12ubuntu0.1~esm2
Available with Ubuntu Pro
libpam-cap 1:2.24-12ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 14.04 LTS
libcap-dev 1:2.24-0ubuntu2+esm2
Available with Ubuntu Pro
libcap2 1:2.24-0ubuntu2+esm2
Available with Ubuntu Pro
libcap2-bin 1:2.24-0ubuntu2+esm2
Available with Ubuntu Pro
libpam-cap 1:2.24-0ubuntu2+esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8193-2
https://ubuntu.com/security/notices/USN-8193-1
CVE-2026-4878

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