Total vulnerabilities in the database
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 5.0 | 5.0.x |
| linux / linux_kernel | 5.3 | 5.3.x |
| canonical / ubuntu_linux | 18.04 | 18.04.x |
| canonical / ubuntu_linux | 19.04 | 19.04.x |