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CVE-2026-45259

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.

Metadata

CVE ID
CVE-2026-45259
State
PUBLISHED
Assigner
freebsd
Reserved
2026-05-11 16:27 UTC
Published
2026-06-27 08:59 UTC
Last updated
2026-06-27 08:59 UTC
Primary CWE
CWE-266
CWE-266: Incorrect Privilege Assignment
Vendor / Product
FreeBSD / FreeBSD
Sources
cve.org  ·  NVD

Severity & Metrics

No CVSS data available.

Affected products (1)
VendorProductPlatformVersions
FreeBSD FreeBSD — 15.0-RELEASE < p10, 14.4-RELEASE < p6, 14.3-RELEASE < p15
Weakness (CWE)
CWESourceDescription
CWE-266 cna CWE-266: Incorrect Privilege Assignment
References (1)
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