CVE-2021-47321

A vulnerability was found in the del_timer() function in the Linux kernel’s watchdog driver. This issue occurs because the function does not wait for the timer handler to finish, which may lead to a situation where the handler runs after the driver that has been removed, causing a use-after-free issue.

Mitigation

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.