Vulnerability Information
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Vulnerability Title
Reference count underflow in shiftfs
Vulnerability Description
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, shiftfs_btrfs_ioctl_fd_replace() installs an fd referencing a file from the lower filesystem without taking an additional reference to that file. After the btrfs ioctl completes this fd is closed, which then puts a reference to that file, leading to a refcount underflow.
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Vulnerability Type
在过期或释放后对资源进行操作
Vulnerability Title
Linux kernel 数字错误漏洞
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。Canonical Ubuntu Linux是英国Canonical公司的一套Linux操作系统。 Canonical Ubuntu Linux 18.04（lts）版本和19.04版本中的Linux kernel 5.0版本和5.3版本的shiftfs实现存在数字错误漏洞。本地攻击者可利用该漏洞造成拒绝服务（系统崩溃）或可能执行任意代码。
CVSS Information
N/A
Vulnerability Type
N/A