Updated:
Description:
In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
CVSS3: 8.8
| OS | Vendor version | Errata |
|---|---|---|
| Ubuntu 18.04 | 4.15.0-156.163 | USN-5073-1 |
| Ubuntu 18.04 AWS | 4.15.0-1111.118 | USN-5073-1 |
| Ubuntu 18.04 HWE Focal | 5.4.0-87.98~18.04.1 | USN-5091-1 |
| Ubuntu 20.04 | 5.4.0-88.99 | USN-5091-1 |
| Ubuntu 18.04 AWS Focal | 5.4.0-1057.60~18.04.1 | USN-5091-1 |
| Ubuntu 18.04 Azure Focal | 5.4.0-1059.62~18.04.1 | USN-5091-1 |
| Ubuntu 20.04 AWS | 5.4.0-1057.60 | USN-5091-1 |
| Ubuntu 16.04 HWE ESM | 4.15.0-156.163~16.04.1 | USN-5073-1 |
| Ubuntu 16.04 GCP ESM | 4.15.0-1108.122~16.04.1 | USN-5073-2 |
| Ubuntu 16.04 AWS HWE ESM | 4.15.0-1111.118~16.04.1 | USN-5073-1 |
| Ubuntu 16.04 Azure ESM | 4.15.0-1123.136~16.04.1 | USN-5073-1 |
| OS | Original kernel version | State |
|---|---|---|
| Ubuntu 18.04 | |
Planned |
| Ubuntu 18.04 AWS | |
Planned |
| Ubuntu 18.04 HWE Focal | |
Planned |
| Ubuntu 20.04 | |
Planned |
| Ubuntu 18.04 AWS Focal | |
Planned |
| Ubuntu 18.04 Azure Focal | |
Planned |
| Ubuntu 20.04 AWS | |
Planned |
| Ubuntu 16.04 HWE ESM | |
Planned |
| Ubuntu 16.04 GCP ESM | |
Planned |
| Ubuntu 16.04 AWS HWE ESM | |
Planned |
| Ubuntu 16.04 Azure ESM | |
Planned |