high7.1Public exploit code

CVE-2019-15792

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() calls fdget(oldfd), the…

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs2019-11-20 · dos · linux · Verified

Impact

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() calls fdget(oldfd), then without further checks passes the resulting file* into shiftfs_real_fdget(), which casts file->private_data, a void* that points to a filesystem-dependent type, to a "struct shiftfs_file_info *". As the private_data is not required to be a pointer, an attacker can use this to cause a denial of service or possibly execute arbitrary code.

Affected products

Vendor	Product	Affected versions
Linux	Linux Kernel	Versions 5.0, 5.3
Canonical	Ubuntu Linux	Versions 18.04, 19.04

Weakness classification

CWE-843

Public exploit code

Impact

Affected products

Weakness classification

References