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.

This vulnerability is rated as a moderate severity because this issue does not allow unauthorized access or data leakage, but it poses a risk of system instability and crashes. The potential for a use-after-free condition can disrupt normal operations.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

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.