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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sat, 17 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Freebsd
Freebsd freebsd
Vendors & Products Freebsd
Freebsd freebsd

Fri, 16 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 15 Oct 2026 06:45:00 +0000

Type Values Removed Values Added
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.
Title Memory safety bugs in kqueue copy-on-fork implementation
Weaknesses CWE-362
CWE-416
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published:

Updated: 2026-10-16T14:18:49.631Z

Reserved: 2026-06-29T01:40:17.499Z

Link: CVE-2026-58099

cve-icon Vulnrichment

Updated: 2026-10-16T14:17:43.395Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-10-15T07:18:02.373

Modified: 2026-10-16T15:17:32.733

Link: CVE-2026-58099

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T19:00:13Z

Weaknesses