ZDI-26-838: FreeBSD Kernel TTY Race Condition Local Privilege Escalation Vulnerability
Source Zero Day Initiative
Not known to be exploited.
Data as of 29 Oct 2026, 19:18 UTC
Rated High by Zero Day Initiative · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
AI-suggested
Since the vulnerability requires prior low-privileged code execution, restricting local access and applying any available FreeBSD Kernel updates when released is recommended.
Description
A local privilege escalation vulnerability exists in the FreeBSD Kernel due to a TTY race condition. Exploitation requires the attacker to already have the ability to execute low-privileged code on the affected system. The vulnerability is assigned CVE-2026-58093 and has a high severity rating.