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.

CVSS 3.1

7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 0% of CVEs (scores of 2026-10-25)

CWEs

CWE-125, CWE-362

Published

2026-10-15

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• freebsd:freebsd

References

• https://security.freebsd.org/advisories/FreeBSD-SA-26:65.kqueue.asc

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