Detections
Analytics

CVE-2021-26910

high

Description

Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.

References

https://www.debian.org/security/2021/dsa-4849

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

https://lists.debian.org/debian-lts-announce/2021/02/msg00015.html

https://github.com/netblue30/firejail/releases/tag/0.9.64.4

https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b

https://github.com/netblue30/firejail

https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt

https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-13694

http://www.openwall.com/lists/oss-security/2021/02/09/1

Details

Source: Mitre, NVD

Published: 2021-02-08

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 6.9

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00444