vulnerability
Red Hat: CVE-2021-47321: kernel: watchdog: Fix possible use-after-free by calling del_timer_sync() (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:L/AC:L/Au:M/C:N/I:N/A:C) | May 21, 2024 | Sep 25, 2024 | Dec 30, 2024 |
Severity
4
CVSS
(AV:L/AC:L/Au:M/C:N/I:N/A:C)
Published
May 21, 2024
Added
Sep 25, 2024
Modified
Dec 30, 2024
Description
In the Linux kernel, the following vulnerability has been resolved:
watchdog: Fix possible use-after-free by calling del_timer_sync()
This driver'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.
Solution(s)
redhat-upgrade-kernelredhat-upgrade-kernel-rt
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