Detections
Analytics
FreeBSD : FreeBSD -- sigqueue(2) missing capability mode restriction (94f20492-6473-11f1-958d-bc241121aa0a)
high Nessus Plugin ID 320465
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 94f20492-6473-11f1-958d-bc241121aa0a advisory.sigqueue(2) was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kern_sigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID.
A process in capability mode can use sigqueue(2) to send signals to any process it could signal following standard Unix permissions, bypassing the Capsicum sandbox restriction. A compromised sandboxed process could interfere with other processes, for example by sending SIGKILL or SIGSTOP. This could be any process running as the same user, or any process, for a superuser sandboxed process.
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
Plugin Details
Severity: High
ID: 320465
File Name: freebsd_pkg_94f20492647311f1958dbc241121aa0a.nasl
Version: 1.1
Type: Local
Family: FreeBSD Local Security Checks
Published: 6/11/2026
Updated: 6/11/2026
Configuration: Enable paranoid mode
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.2
Vulnerability Information
CPE: p-cpe:/a:freebsd:freebsd:freebsd-kernel, cpe:/o:freebsd:freebsd
Required KB Items: Settings/ParanoidReport, Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info
Exploit Ease: No known exploits are available
Patch Publication Date: 6/10/2026
Vulnerability Publication Date: 6/10/2026
Reference Information
CVE: CVE-2026-45259