What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-28 · updated 2026-06-17

Description

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.

Affected products

• Linux kernel: from 5.18.18 before 5.19; from 5.19.2 before 6.1.120; from 6.2 before 6.6.64; from 6.7 before 6.11.11; from 6.12 before 6.12.2 — fixed in 5.19, 6.1.120, 6.11.11, 6.12.2, 6.6.64

How to fix

Upgrade to a fixed version: Linux kernel 5.19, 6.1.120, 6.11.11, 6.12.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ea29bd7d9400d3629683244d609358ed1b12075
• https://git.kernel.org/stable/c/16f351adf733a182224ad24916d7673aa6df02df
• https://git.kernel.org/stable/c/223ee2567a55e4f80315c768d2969e6a3b9fb23d
• https://git.kernel.org/stable/c/74f21be9990a42dc2357bcf87a13e16c6998b90e
• https://git.kernel.org/stable/c/c7d474974954d9af7e0092021223d58f2de128df
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

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