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FreeBSD : FreeBSD -- Kernel use-after-free via tty ioctls (a34b5154-a0ff-11f1-ae1f-bc241121aa0a)

high Nessus Plugin ID 340052

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the a34b5154-a0ff-11f1-ae1f-bc241121aa0a advisory.

 The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty lock, the handler did not revalidate the state of the terminal, and could proceed to link a terminal that was concurrently being destroyed to the calling process' session.
 An unprivileged local user can exploit this race condition to escalate privileges.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?6371acb2

Plugin Details

Severity: High

ID: 340052

File Name: freebsd_pkg_a34b5154a0ff11f1ae1fbc241121aa0a.nasl

Version: 1.1

Type: Local

Published: 8/26/2026

Updated: 8/26/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 4.9

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:P/A:C

CVSS Score Source: CVE-2026-58093

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.1

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:freebsd-kernel

Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 8/26/2026

Vulnerability Publication Date: 8/26/2026

Reference Information

CVE: CVE-2026-58093