---
id: CVE-2024-26947
title: 'ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses

  Since commit a4d5613c4dc6 ("arm: extend pfn_valid to take into account
  freed memory map ali…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 <
    ed95b1e88174566de3dc81d94399aacf2c9dfba4
  - >-
    Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 <
    0c027c2bad7f5111c51a358b5d392e1a695dabff
  - >-
    Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 <
    9f7ddc222cae8254e93d5c169a8ae11a49d912a7
  - >-
    Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 <
    fb3a122a978626b33de3367ee1762da934c0f512
  - >-
    Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 <
    0c66c6f4e21cb22220cbd8821c5c73fc157d20dc
  - Linux 6026d4032dbbe3d7f4ac2c8daa923fe74dcf41c4
  - Linux 65c578935bcc26ddc04e6757b2c7be95bf235b31
  - Linux >= 5.4.167 < 5.5
  - Linux >= 5.10.87 < 5.11
  - Linux 5.14
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-06-17T17:40:49.744241Z'
published: '2024-05-01'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T12:18:02.172Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-26947'
references:
  - url: 'https://git.kernel.org/stable/c/ed95b1e88174566de3dc81d94399aacf2c9dfba4'
  - url: 'https://git.kernel.org/stable/c/0c027c2bad7f5111c51a358b5d392e1a695dabff'
  - url: 'https://git.kernel.org/stable/c/9f7ddc222cae8254e93d5c169a8ae11a49d912a7'
  - url: 'https://git.kernel.org/stable/c/fb3a122a978626b33de3367ee1762da934c0f512'
  - url: 'https://git.kernel.org/stable/c/0c66c6f4e21cb22220cbd8821c5c73fc157d20dc'
tags:
  - cve.org
epss: 0.0023
epssPercentile: 0.13832
ingestedAt: '2026-11-03T12:44:28.802Z'
---

## Overview

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

ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses

Since commit a4d5613c4dc6 ("arm: extend pfn_valid to take into account
freed memory map alignment") changes the semantics of pfn_valid() to check
presence of the memory map for a PFN. A valid page for an address which
is reserved but not mapped by the kernel[1], the system crashed during
some uio test with the following memory layout:

 node   0: [mem 0x00000000c0a00000-0x00000000cc8fffff]
 node   0: [mem 0x00000000d0000000-0x00000000da1fffff]
 the uio layout is：0xc0900000, 0x100000

the crash backtrace like:

  Unable to handle kernel paging request at virtual address bff00000
  [...]
  CPU: 1 PID: 465 Comm: startapp.bin Tainted: G           O      5.10.0 #1
  Hardware name: Generic DT based system
  PC is at b15_flush_kern_dcache_area+0x24/0x3c
  LR is at __sync_icache_dcache+0x6c/0x98
  [...]
   (b15_flush_kern_dcache_area) from (__sync_icache_dcache+0x6c/0x98)
   (__sync_icache_dcache) from (set_pte_at+0x28/0x54)
   (set_pte_at) from (remap_pfn_range+0x1a0/0x274)
   (remap_pfn_range) from (uio_mmap+0x184/0x1b8 [uio])
   (uio_mmap [uio]) from (__mmap_region+0x264/0x5f4)
   (__mmap_region) from (__do_mmap_mm+0x3ec/0x440)
   (__do_mmap_mm) from (do_mmap+0x50/0x58)
   (do_mmap) from (vm_mmap_pgoff+0xfc/0x188)
   (vm_mmap_pgoff) from (ksys_mmap_pgoff+0xac/0xc4)
   (ksys_mmap_pgoff) from (ret_fast_syscall+0x0/0x5c)
  Code: e0801001 e2423001 e1c00003 f57ff04f (ee070f3e)
  ---[ end trace 09cf0734c3805d52 ]---
  Kernel panic - not syncing: Fatal exception

So check if PG_reserved was set to solve this issue.

[1]: https://lore.kernel.org/lkml/Zbtdue57RO0QScJM@linux.ibm.com/

## Affected

- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < ed95b1e88174566de3dc81d94399aacf2c9dfba4`
- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 0c027c2bad7f5111c51a358b5d392e1a695dabff`
- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 9f7ddc222cae8254e93d5c169a8ae11a49d912a7`
- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < fb3a122a978626b33de3367ee1762da934c0f512`
- `Linux >= a4d5613c4dc6d413e0733e37db9d116a2a36b9f3 < 0c66c6f4e21cb22220cbd8821c5c73fc157d20dc`
- `Linux 6026d4032dbbe3d7f4ac2c8daa923fe74dcf41c4`
- `Linux 65c578935bcc26ddc04e6757b2c7be95bf235b31`
- `Linux >= 5.4.167 < 5.5`
- `Linux >= 5.10.87 < 5.11`
- `Linux 5.14`

## Remediation

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