---
id: CVE-2026-64216
title: |-
  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 co…
summary: |-
  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 co…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
published: '2026-07-24'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64216'
references:
  - url: 'https://git.kernel.org/stable/c/3866d015f33aeedf81338dd99154703bef33faef'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6080fa3ecfbb4448a3b47368629534c09b6ec750'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dbe556972100fabb8e5a1b3d2163831ff07b1e8e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00671
epssPercentile: 0.4986
ingestedAt: '2026-07-27T06:16:49.057Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.