CVE-2026-58099
Memory safety bugs in kqueue copy-on-fork implementation
- State
- Published
- Severity
- 7.0 High
- Published
- Oct 15, 2026
- Updated
- Oct 19, 2026
- Reserved
- Jun 29, 2026
Description
When copying knotes from a parent kqueue to a child, the copy code did not correctly exclude marker knotes (used internally to track list traversal position) before marking them as in-flux and releasing the kqueue lock. If another thread freed a marker while the lock was dropped, the subsequent in-flux decrement operated on freed memory.
An unprivileged local user may be able to exploit these races to escalate privileges.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.0 High | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FreeBSDFreeBSD |
|
References
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