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CVE-2026-45250— Stack buffer overflow via setcred(2)

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基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于setcred系统调用在检查调用者权限前将用户提供的补充组列表复制到固定大小的内核栈缓冲区而未验证长度，可能导致栈缓冲区溢出，允许无特权本地用户触发溢出并执行任意代码以提升权限。

AI Predicted 7.8 Difficulty: Hard EPSS 0.41% · P34

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p9 affected
14.4-RELEASE< p5 affected
14.3-RELEASE< p14 affected
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I. Basic Information for CVE-2026-45250

Vulnerability Information
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Vulnerability Title
Stack buffer overflow via setcred(2)
Source: CVE Program / CVE List V5
Vulnerability Description
The setcred(2) system call is only available to privileged users. However, before the privilege level of the caller is checked, the user-supplied list of supplementary groups is copied into a fixed-size kernel stack buffer without first validating its length. If the supplied list exceeds the capacity of that buffer, a stack buffer overflow occurs. Because the bounds check on the supplementary groups list occurs after the kernel stack buffer has already been written, an unprivileged local user may trigger the overflow without holding any special privilege. Successful exploitation may allow an attacker to execute arbitrary code in the context of the kernel, allowing an unprivileged local user to gain elevated privileges on the affected system.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于setcred系统调用在检查调用者权限前将用户提供的补充组列表复制到固定大小的内核栈缓冲区而未验证长度，可能导致栈缓冲区溢出，允许无特权本地用户触发溢出并执行任意代码以提升权限。
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 ~ p9 -

II. Public POCs for CVE-2026-45250

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III. Intelligence Information for CVE-2026-45250

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Vendor Advisories for CVE-2026-45250 (1)

Same Patch Batch · FreeBSD · 2026-05-21 · 7 CVEs total

CVE-2026-45252 Heap overflow in FUSE_LISTXATTR
CVE-2026-45255 Remote code execution via installer Wi-Fi access point scans
CVE-2026-45251 Kernel use-after-free via file descriptor syscalls
CVE-2026-45253 Missing validation in ptrace(PT_SC_REMOTE)
CVE-2026-45254 Incorrect libcap_net limitation list manipulation
CVE-2026-39461 select(2) file descriptor set overflow causes stack overflow

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-121

V. Comments for CVE-2026-45250

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