CVE-2021-47492

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

Description: The vulnerability is related to the Linux kernel's handling of writeback pages in the collapse file function. Currently, collapse file does not explicitly check PG writeback, instead, page has private and try to release page are used to filter writeback pages. This does not work for xfs with blocksize equal to or larger than pagesize, because in such case xfs has no page->private. This makes collapse file bail out early for writeback page. Otherwise, xfs end page writeback will panic. The issue can cause a kernel panic and may lead to a denial-of-service condition.

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