Vulnerability Information
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Vulnerability Title
N/A
Vulnerability Description
fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace.
CVSS Information
N/A
Vulnerability Type
N/A
Vulnerability Title
Linux kernel 安全漏洞
Vulnerability Description
Linux kernel是美国Linux基金会发布的开源操作系统Linux所使用的内核。NFSv4 implementation是其中的一个分布式文件系统协议。 Linux kernel 4.0.2之前版本的fs/namespace.c文件中存在安全漏洞，该漏洞源于程序处理MNT_DETACH umount2系统调用时没有验证是否设置MNT_LOCKED标志。本地攻击者可通过在用户命名空间中调用umount2利用该漏洞绕过既定的访问限制，导航到挂载下的文件系统位置。
CVSS Information
N/A
Vulnerability Type
N/A