CVE-2023-53327

Service interruption via unchecked user-range overflow

Published Sep 16, 2025 · Updated Sep 16, 2025

Integer overflow in Linux kernel iommufd self-tests in 6.2 allows local users to trigger a kernel warning and service interruption. The iommufd_test ioctl path adds an untrusted user pointer and length without first rejecting wraparound, causing range checks in drivers/iommu/iommufd/selftest.c to use an overflowed endpoint. A low-privileged local user must reach the self-test ioctl; systems configured to panic on WARN can crash or reboot, while the default logs a warning.

CVSS severity5.5
Medium
EPSS probability0.14%
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 self-tests in 6.2 allows local users to trigger a kernel warning and service interruption. The iommufd_test ioctl path adds an untrusted user pointer and length without first rejecting wraparound, causing range checks in drivers/iommu/iommufd/selftest.c to use an overflowed endpoint. A low-privileged local user must reach the self-test ioctl; systems configured to panic on WARN can crash or reboot, while the default logs a warning.

The record

CVE
CVE-2023-53327
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=f4b20bb34c83dceade5470288f48f94ce3598ada <3fb3505636d033bbf7a0851dac63d01732c51d62
  3. Affected versionversion=f4b20bb34c83dceade5470288f48f94ce3598ada <adac6508c235a092b91ed9c0110ecf140e9e9441
  4. Affected versionversion=f4b20bb34c83dceade5470288f48f94ce3598ada <fd8c1a4aee973e87d890a5861e106625a33b2c4e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=f4b20bb34c83dceade5470288f48f94ce3598ada <3fb3505636d033bbf7a0851dac63d01732c51d62; version=f4b20bb34c83dceade5470288f48f94ce3598ada <adac6508c235a092b91ed9c0110ecf140e9e9441; version=f4b20bb34c83dceade5470288f48f94ce3598ada <fd8c1a4aee973e87d890a5861e106625a33b2c4e

Published CVSS scores

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

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

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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