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CVE-2026-45259— sigqueue(2) missing capability mode restriction

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是FreeBSD基金会开源的一套类Unix操作系统。 FreeBSD存在权限许可和访问控制问题漏洞，该漏洞源于Capsicum模块中kern_sigqueue实现缺少能力模式检查，可能导致沙盒进程绕过限制向其他进程发送信号。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.13% · P2

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p10 affected
14.4-RELEASE< p6 affected
14.3-RELEASE< p15 affected
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I. Basic Information for CVE-2026-45259

Vulnerability Information
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Vulnerability Title
sigqueue(2) missing capability mode restriction
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会开源的一套类Unix操作系统。 FreeBSD存在权限许可和访问控制问题漏洞，该漏洞源于Capsicum模块中kern_sigqueue实现缺少能力模式检查，可能导致沙盒进程绕过限制向其他进程发送信号。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.0-RELEASE ~ p10 -

II. Public POCs for CVE-2026-45259

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III. Intelligence Information for CVE-2026-45259

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Vendor Advisories for CVE-2026-45259 (1)

Same Patch Batch · FreeBSD · 2026-06-27 · 7 CVEs total

CVE-2026-49416 Integer overflow in vt(4) CONS_HISTORY ioctl
CVE-2026-49414 ASLR bypass for setuid executables via procctl(2)
CVE-2026-49413 Flaw in Linuxulator execution of setugid binaries
CVE-2026-49412 Use-after-free bug in the IPV6_MSFILTER socket option handler
CVE-2026-45258 Multiple vulnerabilities in the sound(4) mmap path
CVE-2026-49417 Multiple vulnerabilities in the sound(4) mmap path

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-266

V. Comments for CVE-2026-45259

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