Out-of-bounds Read in FreeBSD

CVE-2026-58100

kqueue_fork_copy_knote() indexed into the child's file descriptor table using a knote's file descriptor number without a bounds check. Because the child's table is copied before knotes are transferred, a concurrent thread in the parent could grow the parent's table and register knotes with file descriptor numbers beyond the end of the child's table, causing an out-of-bounds read. An unprivileged local user may be able to exploit these races to escalate privileges.

Vulnerability class: Buffer Overflow

Published 2026-10-15 · last modified 2026-10-15.