CVE-2026-64216

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()

netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it

is wanting to unlock and compares that to rreq->no_unlock_folio so that it

doesn't unlock a folio being read for netfs_perform_write() or

netfs_write_begin().

However, given that netfs_unlock_abandoned_read_pages() is called _after_

NETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to

dereference is the one specified by ->no_unlock_folio as ownership

immediately reverts to the caller.

Fix this by storing the folio pointer instead and using that rather than

the index. Also fix netfs_unlock_read_folio() where the same applies.