CVE-2026-77059
boneIO Black contains a TOCTOU race condition in the create_timedatectl_sudoers_file() function in…
- Risk score
- 53/100
- CVSS
- 8.8 v4.0
- Published
- 26 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- boneIO Black contains a TOCTOU race condition in the create_timedatectl_sudoers_file() function in boneio/webui/routes/timezone_sudoers.py. The function writes sudoers rules to a predictable temporary file, validates them, then installs them with root privileges. A local attacker can exploit the race window between va…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.6.0 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.8 high
References
Original description
boneIO Black contains a TOCTOU race condition in the create_timedatectl_sudoers_file() function in boneio/webui/routes/timezone_sudoers.py. The function writes sudoers rules to a predictable temporary file, validates them, then installs them with root privileges. A local attacker can exploit the race window between validation and installation to substitute malicious content, or use the predictable filename for symlink attacks, resulting in arbitrary sudoers rule injection and local privilege escalation to root. This issue was fixed in version 1.6.0.
Last activity 26 Oct 2026. Patch Forecast updates every hour.