CVE-2019-15791
Last modified
CVE-2019-15791 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 1.32% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | 5.0 |
| Linux | Linux Kernel | 5.3 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.04 |
References
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=601a64857b3d7040ca15c39c929e6b9db3373ec1Mailing List, Patch, Third 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/?id=601a64857b3d7040ca15c39c929e6b9db3373ec1Mailing List, Patch, Third Party Advisory
- https://usn.ubuntu.com/usn/usn-4183-1Third Party Advisory
- https://usn.ubuntu.com/usn/usn-4184-1Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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