CVE-2021-47556

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to a potential NULL pointer dereference in the ethtool set coalesce() function. This function uses both the .get coalesce() and .set coalesce() callbacks, but the check for their availability is buggy. As a result, changing the coalesce settings on a device where the driver provides only one of the callbacks can lead to a NULL pointer dereference instead of an error. The condition has been fixed to ensure the availability of both callbacks, which also matches the netlink code. This issue only affects the legacy ioctl path and requires a specific combination of driver options.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.