CVE-2021-47589

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

Description The vulnerability is related to a double free issue in the igbvf probe function. When register netdev fails, the program goes to the err hw init label and then to the err ioremap label. In free netdev, there is a list for each entry safe and netif napi del which aims to delete all entries in dev->napi list. However, adapter->rx ring has been freed below the err hw init label, causing a use-after-free (UAF) issue. The KASAN logs indicate a use-after-free in free netdev+0x1fd/0x450. To patch the problem, one can refer to igbvf remove and delete the entry before adapter->rx ring.

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