Patchlage

CVE-2026-64216

CVE CVE-2026-64216EUVD EUVD-2026-48624Published 2026-07-24T15:23:04.000ZLast changed 2026-08-05T12:40:04.000ZCVSS 9.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

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