CVE-2026-45259

Published Jun 27, 2026

Last updated 25 days ago

CVSS medium 6.5

Overview

Description
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.
Source
secteam@freebsd.org
NVD status
Analyzed
Products
freebsd

Risk scores

CVSS 3.1

Type
Secondary
Base score
6.5
Impact score
4
Exploitability score
2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Severity
MEDIUM

Weaknesses

secteam@freebsd.org
CWE-266

Social media

Hype score
Not currently trending

  1. 🚨*CVE* CVE-2026-45259 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… https://t.co/HZk8ljZOAD ----- Traducción: CVE-2026-45259 sig… https://t.co/utmtNg

    @infoflowcloud

    27 Jun 2026

    23 Impressions

    0 Retweets

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Configurations

Related CVEs

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  5. The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock. During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory. An unprivileged local user can exploit this use-after-free to escalate privileges.•CVE-2026-49412

References

Sources include official advisories and independent security research.