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CVE Record

CVE-2024-56683: drm/vc4: hdmi: Avoid hang with debug registers when suspended

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: hdmi: Avoid hang with debug registers when suspended Trying to read /sys/kernel/debug/dri/1/hdmi1_regs when the hdmi is disconnected results in a fatal system hang. This is due to the pm suspend code disabling the dvp clock. That is just a gate of the 108MHz clock in DVP_HT_RPI_MISC_CONFIG, which results in accesses hanging AXI bus. Protect against this.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-56683 is a Linux kernel stability flaw in the vc4 HDMI graphics driver. Reading a specific HDMI debug register file while HDMI is disconnected can hang the whole system. The business impact is availability loss on exposed systems, not data theft based on the supplied evidence.

Executive priority

Prioritize patching affected appliance, kiosk, embedded, or workstation fleets where a system hang would interrupt service. This is not supported as a remote compromise issue by the provided evidence, but availability impact can still be operationally meaningful.

Technical view

The issue is in drm/vc4 HDMI debug register handling. When power-management suspend disables the DVP clock, access to /sys/kernel/debug/dri/1/hdmi1_regs can hang the AXI bus, causing a fatal system hang. Upstream stable commits add protection against this suspended-clock access path.

Likely exposure

Likely limited to Linux systems using the vc4 HDMI driver with affected kernels and accessible debugfs. Sources do not define required privileges; the referenced path is under /sys/kernel/debug, suggesting local debug or administrative exposure rather than remote network exposure.

Exploitation context

The CVE is not listed as KEV, and the supplied sources do not report active exploitation. The described trigger is a local read of a debug register file while HDMI is disconnected or suspended, causing denial of service through a system hang.

Researcher notes

Evidence is strongest for root cause and fix references, but weak for exploitability boundaries. CVSS, CWE, and privilege requirements are absent in the bundle. Treat this as a local availability issue unless vendor-specific advisories identify broader exposure.

Mitigation direction

  • Apply vendor kernel updates that include the upstream stable fixes for CVE-2024-56683.
  • For Debian LTS systems, review and apply the referenced Debian LTS kernel update.
  • Restrict debugfs access to trusted administrators while patch rollout is pending.
  • Avoid operational use of vc4 HDMI debug register reads on affected systems until updated.

Validation and detection

  • Inventory systems for Linux kernels using the drm/vc4 HDMI driver.
  • Check kernel package changelogs or vendor advisories for CVE-2024-56683 inclusion.
  • Confirm debugfs is not broadly accessible to untrusted local users.
  • After updating, verify the installed kernel version maps to the vendor-fixed build.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
7Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux25eb441d55d479581a65bcc9de88bc1d86bf76c1, 25eb441d55d479581a65bcc9de88bc1d86bf76c1, 25eb441d55d479581a65bcc9de88bc1d86bf76c1, 25eb441d55d479581a65bcc9de88bc1d86bf76c1, 25eb441d55d479581a65bcc9de88bc1d86bf76c1, 1da00a63f0e798f0fd0dcf623b16c16e13f93615, f70c25cf34f91cc6f40e79a5b7565fd0272d7396, 5.18.18, 5.19.2unaffected
LinuxLinux6.0, 0, 6.1.120, 6.6.64, 6.11.11, 6.12.2, 6.13affected
Weakness

CWE details

No CWE listed

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