Vulnerability DatabaseCVE-2021-26910
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CVE-2021-26910
Published:February 08, 2021
Updated:July 21, 2026
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.
Related Resources (11)
https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b
https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt
https://security.gentoo.org/glsa/202105-19
https://github.com/netblue30/firejail/releases/tag/0.9.64.4
https://security.alpinelinux.org/vuln/CVE-2021-26910
https://security-tracker.debian.org/tracker/CVE-2021-26910
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-26910
http://www.openwall.com/lists/oss-security/2021/02/09/1
https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/
https://www.debian.org/security/2021/dsa-4849
https://lists.debian.org/debian-lts-announce/2021/02/msg00015.html
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CVSS v4
Base Score:
8.5
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.8
Attack Complexity
LOW
Attack Vector
LOCAL
Availability
HIGH
Confidentiality
HIGH
Integrity
HIGH
Privileges Required
LOW
Scope
UNCHANGED
User Interaction
NONE
Weakness Type (CWE)
Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-367
EPSS
Base Score:
0.44