CVE-2023-52634

Local system hang via incorrect FIFO toggling

Published Apr 2, 2024 · Updated May 11, 2026

A display-management flaw in Linux 6.7 through 6.7.3 allows local users to hang systems by changing refresh rates after HDMI mode switches. The disable_otg_wa path unnecessarily disables and enables FIFO, setting both HPO and DIG registers when only HPO should be set. Exploitation requires local access, an affected AMD display pipeline, an HDMI mode switch, and a later refresh-rate change; no data disclosure or modification is reported.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A display-management flaw in Linux 6.7 through 6.7.3 allows local users to hang systems by changing refresh rates after HDMI mode switches. The disable_otg_wa path unnecessarily disables and enables FIFO, setting both HPO and DIG registers when only HPO should be set. Exploitation requires local access, an affected AMD display pipeline, an HDMI mode switch, and a later refresh-rate change; no data disclosure or modification is reported.

The record

CVE
CVE-2023-52634
Published
Apr 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 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=6.7
  2. Affected versionversion=8774029f76b9806f2f3586bb0502408076767fd5 <2ce156482a6fef349d2eba98e5070c412d3af662
  3. Affected versionversion=8774029f76b9806f2f3586bb0502408076767fd5 <ce29728ef6485a367934cc100249c66dd3cde5b6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=8774029f76b9806f2f3586bb0502408076767fd5 <2ce156482a6fef349d2eba98e5070c412d3af662; version=8774029f76b9806f2f3586bb0502408076767fd5 <ce29728ef6485a367934cc100249c66dd3cde5b6

Published CVSS scores

5.5NIST NVDCVSS: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.

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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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