CVE-2023-53706

System crash via architecture-unaware devdax vmemmap handling

Published Oct 22, 2025 · Updated Oct 22, 2025

A devdax probing flaw in Linux 5.19 through 6.3.4 allows local users to crash ppc64 systems during device initialization. vmemmap_populate_compound_pages assumes optimized vmemmap mappings exist in the init_mm page table, while powerpc hash translation instead uses bolted hardware-page-table entries. The demonstrated gate is a ppc64 hash-MMU system with devdax; probing the device triggers a bad-area kernel fault and interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A devdax probing flaw in Linux 5.19 through 6.3.4 allows local users to crash ppc64 systems during device initialization. vmemmap_populate_compound_pages assumes optimized vmemmap mappings exist in the init_mm page table, while powerpc hash translation instead uses bolted hardware-page-table entries. The demonstrated gate is a ppc64 hash-MMU system with devdax; probing the device triggers a bad-area kernel fault and interrupts the system.

The record

CVE
CVE-2023-53706
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4917f55b4ef963e2d2288fe4eb651728be8db406 <87a7ae75d7383afa998f57656d1d14e2a730cc47
  2. Affected versionversion=4917f55b4ef963e2d2288fe4eb651728be8db406 <8f4603588acf5807aa1f1b4b1ea2b0365acd71f0
  3. Affected versionversion=5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4917f55b4ef963e2d2288fe4eb651728be8db406 <87a7ae75d7383afa998f57656d1d14e2a730cc47; version=4917f55b4ef963e2d2288fe4eb651728be8db406 <8f4603588acf5807aa1f1b4b1ea2b0365acd71f0; version=5.19

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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