CVE-2023-52455

Display mapping failure via zero-length IOVA reservation

Published Feb 23, 2024 · Updated May 11, 2026

Improper IOVA reservation in Linux 6.3 and later allows local users to disrupt display IOMMU mappings on affected systems. drivers/iommu/of_iommu.c reserves an IOVA range when firmware supplies a zero address and size, inserting an invalid rbtree node whose upper page-frame bound is below its lower bound. The condition requires an iommu-addresses entry for an absent framebuffer; it can reserve the valid IOVA space and prevent display mappings.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper IOVA reservation in Linux 6.3 and later allows local users to disrupt display IOMMU mappings on affected systems. drivers/iommu/of_iommu.c reserves an IOVA range when firmware supplies a zero address and size, inserting an invalid rbtree node whose upper page-frame bound is below its lower bound. The condition requires an iommu-addresses entry for an absent framebuffer; it can reserve the valid IOVA space and prevent display mappings.

The record

CVE
CVE-2023-52455
Published
Feb 23, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 23, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=6.3
  2. Affected versionversion=a5bf3cfce8cb77d9d24613ab52d520896f83dd48 <5e23e283910c9f30248732ae0770bcb0c9438abf
  3. Affected versionversion=a5bf3cfce8cb77d9d24613ab52d520896f83dd48 <98b8a550da83cc392a14298c4b3eaaf0332ae6ad
  4. Affected versionversion=a5bf3cfce8cb77d9d24613ab52d520896f83dd48 <bb57f6705960bebeb832142ce9abf43220c3eab1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=a5bf3cfce8cb77d9d24613ab52d520896f83dd48 <5e23e283910c9f30248732ae0770bcb0c9438abf; version=a5bf3cfce8cb77d9d24613ab52d520896f83dd48 <98b8a550da83cc392a14298c4b3eaaf0332ae6ad; version=a5bf3cfce8cb77d9d24613ab52d520896f83dd48 <bb57f6705960bebeb832142ce9abf43220c3eab1

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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.

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Technologies

Your stack

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Your stack

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