CVE-2019-15791 — HIGH (7.1)

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 Score

7.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Linux	Linux Kernel	5.0
Canonical	Ubuntu Linux	18.04

Related Weaknesses (CWE)

CWE-672 CWE-191

References

https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?Mailing ListPatchThird Party Advisory
https://usn.ubuntu.com/usn/usn-4183-1Third Party Advisory
https://usn.ubuntu.com/usn/usn-4184-1Third Party Advisory
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?Mailing ListPatchThird Party Advisory
https://usn.ubuntu.com/usn/usn-4183-1Third Party Advisory
https://usn.ubuntu.com/usn/usn-4184-1Third Party Advisory

FAQ

What is CVE-2019-15791?

CVE-2019-15791 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 with...

How severe is CVE-2019-15791?

CVE-2019-15791 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2019-15791?

Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Canonical Ubuntu Linux.