CVE-2026-58100

Memory safety bugs in kqueue copy-on-fork implementation

Published Oct 15, 2026 CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:o:freebsd:freebsd:15.1:-:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:15.1:p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:15.1:p2:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:15.1:p3:*:*:*:*:*:*
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

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

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

Type Values Removed Values Added
Description 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.
Title Memory safety bugs in kqueue copy-on-fork implementation
Weaknesses CWE-125
CWE-362
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
freebsd
Published
Updated
Oct 19, 2026, 2:11 PM
Reserved
Jun 29, 2026, 1:40 AM
Status
Analyzed
Published
Oct 15, 2026, 7:18 AM
Modified
Oct 19, 2026, 9:01 PM