CVE-2021-47324
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Linux Kernel
PublishedMay 21, 2024
First seenMay 21, 2024
Weakness typeCWE-416Use after free
How to fix
Update
- linux linux_kernel4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 4.4.276, 4.5 ≤ v < 4.9.276, 4.10 ≤ v < 4.14.240, 4.15 ≤ v < 4.19.198, 4.20 ≤ v < 5.4.134, 5.5 ≤ v < 5.10.52, 5.11 ≤ v < 5.12.19, 5.13 ≤ v < 5.13.4 | 4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4 |
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