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.
History

Mon, 19 Oct 2026 21:15:00 +0000

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:*:*:*:*:*:*

Mon, 19 Oct 2026 15:30:00 +0000

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'}


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

cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published: 2026-10-15T06:31:18.042Z

Updated: 2026-10-19T14:10:47.179Z

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 : Analyzed

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

Modified: 2026-10-19T21:02:15.750

Link: CVE-2026-58099

cve-icon Redhat

No data.