Vulnerability Information
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Vulnerability Title
Reference counting error in overlayfs/shiftfs error path when used in conjuction with aufs
Vulnerability Description
Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_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 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。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19.10版本中的Linux kernel 5.0版本和5.3版本存在安全漏洞。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