CVE-2023-53550

Local denial of service via sysfs type confusion

Published Oct 4, 2025 · Updated Oct 4, 2025

Type confusion in Linux kernel 6.4 through 6.4.10 allows local users to crash CFI-enabled systems by reading amd-pstate sysfs attributes. drivers/cpufreq/amd-pstate.c registers kobj_attribute objects under the CPU root device, whose sysfs dispatch expects device_attribute callbacks. A low-privileged local read reaches dev_attr_show with an incompatible show_status callback type, causing a CFI failure and service interruption.

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

Type confusion in Linux kernel 6.4 through 6.4.10 allows local users to crash CFI-enabled systems by reading amd-pstate sysfs attributes. drivers/cpufreq/amd-pstate.c registers kobj_attribute objects under the CPU root device, whose sysfs dispatch expects device_attribute callbacks. A low-privileged local read reaches dev_attr_show with an incompatible show_status callback type, causing a CFI failure and service interruption.

The record

CVE
CVE-2023-53550
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 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=3666062b87ec8be4b85dc475dfb54bb17e10a7f6 <5e720f8c8c9d959283c3908bbf32a91a01a86547
  2. Affected versionversion=3666062b87ec8be4b85dc475dfb54bb17e10a7f6 <ddcfc33a20380508f7fea18e1c330abe17ed4fc0
  3. Affected versionversion=6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3666062b87ec8be4b85dc475dfb54bb17e10a7f6 <5e720f8c8c9d959283c3908bbf32a91a01a86547; version=3666062b87ec8be4b85dc475dfb54bb17e10a7f6 <ddcfc33a20380508f7fea18e1c330abe17ed4fc0; version=6.4

Published CVSS scores

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