---
id: CVE-2026-93239
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  arm64: mm: Fix the lockless page-table walk in show_pte()

  show_pte() walks page tables locklessly and can run with interrupts
  enabled
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  arm64: mm: Fix the lockless page-table walk in show_pte()

  show_pte() walks page tables locklessly and can run with interrupts
  enabled. A concurrent teardown can free a…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1d18c47c735e8adfe531fc41fae31e98f86b68fe <
    08d931a0a850ad16a64f2cd23a19f40795cdbdf7
  - >-
    Linux >= 1d18c47c735e8adfe531fc41fae31e98f86b68fe <
    b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1
  - >-
    Linux >= 1d18c47c735e8adfe531fc41fae31e98f86b68fe <
    68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3
  - >-
    Linux >= 1d18c47c735e8adfe531fc41fae31e98f86b68fe <
    0f05d95b99164a9ccc4cf4a4920e0ff0228138ad
  - >-
    Linux >= 1d18c47c735e8adfe531fc41fae31e98f86b68fe <
    a77644d009dece1104b6fcc6e322b0e4503db0d6
  - Linux 3.7
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T16:17:19.690'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93239'
references:
  - url: 'https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T15:45:56.656Z'
---

## Overview

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

arm64: mm: Fix the lockless page-table walk in show_pte()

show_pte() walks page tables locklessly and can run with interrupts
enabled. A concurrent teardown can free a table page while it is being
walked. It can also clear a parent entry after show_pte() checked it; the
regular pXd_offset() helpers then reread the cleared entry and can derive a
bogus lower-level pointer and fault again.

Use the lockless offset helpers with the saved parent entries, as
gup_fast() does, and pass the saved PMD to pte_offset_map().

For task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable
local interrupts around the walk to hold off RCU-deferred table frees and
block the tlb_remove_table_sync_one() IPI until the walk is finished.

Place the IRQ guard after the header print. This does not make the output a
consistent snapshot, but prevents the task page-table walk from
dereferencing a released table page or deriving a pointer from a different
parent value.

## Remediation

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