The n_tty_write function in drivers/tty/n_tty.c in the Linux kernel through 3.14.3 does not properly manage tty driver access in the "LECHO & !OPOST" case, which allows local users to cause a denial of service (memory corruption and system crash) or gain privileges by triggering a race condition involving read and write operations with long strings.
The n_tty_write function in drivers/tty/n_tty.c in the Linux kernel through 3.14.3 does not properly manage tty driver access in the "LECHO & !OPOST" case, which allows local users to cause a denial of service (memory corruption and system crash) or gain privileges by triggering a race condition involving read and write operations with long strings.
Why this VPI (explainable, experimental)
VPI breakdown
| Impact | 55.00 |
| Exploitation signal(KEV listed) | ×1.50 |
| VPI | 82.50 |
VPI formula vpi-v1
Required Action
The impacted product is end-of-life and should be disconnected if still in use.
| Source | CVSS Version | Base Score | Severity | Vector String | Assessment Date |
|---|---|---|---|---|---|
| NVDNIST | 3.1 | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | 04/20/2026 |
| NVDNIST | 2.0 | 6.9 |
| AV:L/AC:M/Au:N/C:C/I:C/A:C |
| 04/20/2026 |