CVE-2023-54239

Kernel warning via overflowing iommufd mapping range

Published Dec 30, 2025 · Updated Dec 30, 2025

Integer overflow in Linux kernel iommufd allows local users to trigger a kernel warning through a crafted user-address mapping. iopt_alloc_pages adds the user pointer to the mapping length without rejecting wraparound, allowing the calculated end address to pass zero before page pinning. Access to the iommufd ioctl path is required; the demonstrated result is WARN_ON output, which becomes a kernel panic only when panic_on_warn is enabled.

CVSS severity7.0
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux kernel iommufd allows local users to trigger a kernel warning through a crafted user-address mapping. iopt_alloc_pages adds the user pointer to the mapping length without rejecting wraparound, allowing the calculated end address to pass zero before page pinning. Access to the iommufd ioctl path is required; the demonstrated result is WARN_ON output, which becomes a kernel panic only when panic_on_warn is enabled.

The record

CVE
CVE-2023-54239
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=6.2
  2. Affected versionversion=8d160cd4d5066f864ec0f2c981470e55ac03ac27 <800963e7eb001ada8cf2418f159fb649694467f1
  3. Affected versionversion=8d160cd4d5066f864ec0f2c981470e55ac03ac27 <e4395701330fc4aee530905039516fe770b81417

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=8d160cd4d5066f864ec0f2c981470e55ac03ac27 <800963e7eb001ada8cf2418f159fb649694467f1; version=8d160cd4d5066f864ec0f2c981470e55ac03ac27 <e4395701330fc4aee530905039516fe770b81417

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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

T1499.004Application or System Exploitation

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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