A Firejail security update has been released for Gentoo Linux.

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Gentoo Linux Security Advisory GLSA 202105-19
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  https://security.gentoo.org/
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Severity: High
Title: Firejail: Privilege escalation
Date: May 26, 2021
Bugs: #769542
ID: 202105-19

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Synopsis
========

A vulnerability was discovered in Firejail which may allow local
attackers to gain root privileges.

Background
==========

A SUID program that reduces the risk of security breaches by
restricting the running environment of untrusted applications using
Linux namespaces and seccomp-bpf.

Affected packages
=================

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Package / Vulnerable / Unaffected
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1 sys-apps/firejail < 0.9.64.4 >= 0.9.64.4

Description
===========

It was discovered that a flaw in Firejail's OverlayFS code allowed
restricted programs to escape sandbox.

Impact
======

A local attacker could obtain arbitrary file system access via an
application running within a Firejail sandbox, possibly resulting in
privilege escalation.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Firejail users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/firejail-0.9.64.4"

References
==========

[ 1 ] CVE-2021-26910
  https://nvd.nist.gov/vuln/detail/CVE-2021-26910

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202105-19

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
  https://bugs.gentoo.org.

License
=======

Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

  https://creativecommons.org/licenses/by-sa/2.5