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Date: Tue, 9 Feb 2021 07:36:15 +0100
From: Salvatore Bonaccorso <>
Subject: Re: [cve-pending] Firejail: root privilege escalation
 in OverlayFS code


On Mon, Feb 08, 2021 at 02:15:05PM +0000, netblue30 wrote:
> Security Advisory - Feb 8, 2021
> Summary: A vulnerability resulting in root privilege escalation was discovered in Firejail's OverlayFS code,
> Versions affected: Firejail software versions starting with 0.9.30.
> Long Term Support (LTS) Firejail branch is not affected by this bug.
> Workaround: Disable overlayfs feature at runtime. In a text editor open /etc/firejail/firejail.config file,
> and set "overlayfs" entry to "no".
>       $ grep overlayfs /etc/firejail/firejail.config
>       # Enable or disable overlayfs features, default enabled.
>       overlayfs no
> Fix: The bug is fixed in Firejail version
> GitHub commit: (file
> Credit:  Security researcher Roman Fiedler analyzed the code and discovered the vulnerability.
> Functional PoC exploit code was provided to Firejail development team.
> A description of the problem is here on Roman's blog:

CVE-2021-26910 was assigned for this issue according to .


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