This bug was fixed in the package firejail - 0.9.62-3ubuntu0.1
--------------- firejail (0.9.62-3ubuntu0.1) focal-security; urgency=low
* SECURITY UPDATE: bypass of access restrictions (LP: #1916767) - disable OverlayFS support which contains a TOCTOU race condition between a stat operation and an OverlayFS mount. - CVE-2021-26910
-- Reiner Herrmann <email address hidden> Sat, 27 Mar 2021 15:20:50 +0000
This bug was fixed in the package firejail - 0.9.62-3ubuntu0.1
---------------
firejail (0.9.62-3ubuntu0.1) focal-security; urgency=low
* SECURITY UPDATE: bypass of access restrictions (LP: #1916767)
- disable OverlayFS support which contains a TOCTOU race condition
between a stat operation and an OverlayFS mount.
- CVE-2021-26910
-- Reiner Herrmann <email address hidden> Sat, 27 Mar 2021 15:20:50 +0000