CVE-2026-58099

CVE-2026-58099 · Memory safety bugs in kqueue copy-on-fork implementation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.0 · High · EPSS 0.1%

Published

2026-10-15T06:31:18.042Z

Updated

2026-10-19T14:10:47.179Z

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