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CVE-2026-49413— Flaw in Linuxulator execution of setugid binaries

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，该漏洞源于在execve(2)系统调用中，辅助向量构建时P_SUGID进程标志尚未设置，导致AT_SECURE错误地为set-user-ID和set-group-ID可执行文件设置为零，从而允许非特权本地用户通过LD_PRELOAD向这些可执行文件注入共享库，获取该二进制文件的权限。

AI Predicted 7.8 Difficulty: Easy 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-2026-49413

Vulnerability Information
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Vulnerability Title
Flaw in Linuxulator execution of setugid binaries
Source: CVE Program / CVE List V5
Vulnerability Description
The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the P_SUGID process flag. During execve(2), this flag is not yet set at the point where the auxiliary vector is constructed, so AT_SECURE was incorrectly set to zero for set-user-ID and set-group-ID executables. An unprivileged local user can inject a shared library via LD_PRELOAD into a set-user-ID or set-group-ID Linux binary, gaining the privileges of that binary.
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，该漏洞源于在execve(2)系统调用中，辅助向量构建时P_SUGID进程标志尚未设置，导致AT_SECURE错误地为set-user-ID和set-group-ID可执行文件设置为零，从而允许非特权本地用户通过LD_PRELOAD向这些可执行文件注入共享库，获取该二进制文件的权限。
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-2026-49413

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III. Intelligence Information for CVE-2026-49413

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Vendor Advisories for CVE-2026-49413 (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-2026-49412 Use-after-free bug in the IPV6_MSFILTER socket option handler
CVE-2026-45259 sigqueue(2) missing capability mode restriction
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-2026-49413

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