---
id: CVE-2026-80685
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mm/util: don't read __page_2 for order-1 folios in snapshot_page()

  snapshot_page() currently reads __page_2 after checking nr_pages > 1, but
  it should only do so when …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mm/util: don't read __page_2 for order-1 folios in snapshot_page()

  snapshot_page() currently reads __page_2 after checking nr_pages > 1, but
  it should only do so when …
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 31a31da8a6187f1e5448ec73222e01d7d3fed4aa <
    9668ffe0e2a5e2399dce281620198a2e415871fc
  - >-
    Linux >= 31a31da8a6187f1e5448ec73222e01d7d3fed4aa <
    c649324571206a30949765320b91ccdb4c1722dc
  - >-
    Linux >= 31a31da8a6187f1e5448ec73222e01d7d3fed4aa <
    7441d6348c70738e9ed307510db171c7a9b3f4bf
  - Linux 4117738bd42c8ab58090729daf0f8472a936f662
  - Linux >= 6.12.111 < 6.13
  - Linux 6.15
published: '2026-08-28'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T14:17:20.360'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80685'
references:
  - url: 'https://git.kernel.org/stable/c/7441d6348c70738e9ed307510db171c7a9b3f4bf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9668ffe0e2a5e2399dce281620198a2e415871fc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c649324571206a30949765320b91ccdb4c1722dc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80685.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80685'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2525454'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80685'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80685'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026082802-CVE-2026-80685-a81f@gregkh/T
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00164
epssPercentile: 0.05573
ingestedAt: '2026-09-21T13:37:22.837Z'
cwe:
  - CWE-125
scores:
  nvd: 7.1
  vendor: 5.5
---

## Overview

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

mm/util: don't read __page_2 for order-1 folios in snapshot_page()

snapshot_page() currently reads __page_2 after checking nr_pages > 1, but
it should only do so when nr_pages > 2.

If an order-1 folio is allocated at the end of a vmemmap section,
__page_2 will not exist and reading it will cause a fault.

During DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed
on the page isolation path while reading an order-1 folio's __page_2 from
an adjacent absent section (unmapped vmemmap).

Fix this to avoid reading memmap that doesn't exist (e.g., a vmemmap
hole).

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80685.json)