Alerts This Week
Warning Icon 1 1,149
Alerts This Week
Warning Icon 1 1,149

Ubuntu 25.10 libcap Important Escalation Risk CVE-2026-4878

ubuntu
Calendar Grey April 21, 2026
Dist Ubuntu Esm H88
A local attacker could exploit libcap in Ubuntu to modify capabilities on files, prompting an important security update.
libcap could be made to modify capabilities on arbitrary files.

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.

Topics%20covered

Topics Covered

security advisory Ubuntu important escalation capabilities libcap

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8193-1

Topics%20covered

Topics Covered

security advisory Ubuntu important escalation capabilities libcap

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

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here