CVE-2021-26910 is a high-severity Time-of-Check to Time-of-Use (TOCTOU) race condition vulnerability affecting Firejail versions prior to 0.9.64.4, including various Debian Linux distributions. This flaw allows a local attacker to bypass intended access restrictions by manipulating the timing between a stat operation and an OverlayFS mount. With a CVSS score of 7.0, successful exploitation could lead to high confidentiality, integrity, and availability impacts, though it requires high attack complexity. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.9.64.4CPE matchmatch criteria | cpe:2.3:a:firejail_project:firejail:*:*:*:*:*:*:*:* | ||
9.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | ||
10.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.4 InfoSec Media, 0.1 Vendor Blog, and 0.0 Security Researcher mentions.