CVE-2021-26910

HIGH

Firejail < 0.9.64.4 - Time-of-check Time-of-use Race Condition via OverlayFS Mount

Title source: llm
STIX 2.1

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 (8)

Core 8
Core References
Exploit, Third Party Advisory x_refsource_misc
https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/netblue30/firejail/releases/tag/0.9.64.4
Exploit, Mailing List, Patch, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/02/09/1
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4849
Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/02/msg00015.html
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202105-19

Scores

CVSS v3 7.8
EPSS 0.0044
EPSS Percentile 35.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-367
Status published
Products (3)
debian/debian_linux 9.0
debian/debian_linux 10.0
firejail_project/firejail < 0.9.64.4
Published Feb 08, 2021
Tracked Since Feb 18, 2026