VULNERABILITY INTELLIGENCE

CVE-2019-15791

CVSS score7.1 HIGH
EPSS probability1.32%
CISA KEVNot currently listed
Published2020-04-24
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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.

Weakness classification

  • CWE-191: Integer Underflow (Wrap or Wraparound)
  • CWE-672: Operation on a Resource after Expiration or Release

Primary references