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

Stack buffer overflow via setcred(2)

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.

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栈缓冲区溢出

FreeBSD 安全漏洞

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。

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