CVE-2026-53056 drm/msm/dpu: fix mismatch between power and frequency
A race condition in the Linux kernel DPU driver can cause system instability or crashes due to voltage and clock frequency mismatches during runtime suspend.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53056?
CVE-2026-53056 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/msm/dpu: fix mismatch between power and frequency
During DPU runtime suspend, calling dev_pm_opp_set_rate(dev, 0) drops the MMCX rail to MIN_SVS while the core clock frequency remains at its original (highest) rate. When runtime resume re-enables the clock, this may result in a mismatch between the rail voltage and the clock rate.
For example, in the DPU bind path, the sequence could be: cpu0: dev_sync_state -> rpmhpd_sync_state cpu1: dpu_kms_hw_init timeline 0 ------------------------------------------------> t
After rpmhpd_sync_state, the voltage performance is no longer guaranteed to stay at the highest level. During dpu_kms_hw_init, calling dev_pm_opp_set_rate(dev, 0) drops the voltage, causing the MMCX rail to fall to MIN_SVS while the core clock is still at its maximum frequency. When the power is re-enabled, only the clock is enabled, leading to a situation where the MMCX rail is at MIN_SVS but the core clock is at its highest rate. In this state, the rail cannot sustain the clock rate, which may cause instability or system crash.
Remove the call to dev_pm_opp_set_rate(dev, 0) from dpu_runtime_suspend to ensure the correct vote is restored when DPU resumes.
Patchwork: https://patchwork.freedesktop.org/patch/710077/
Which versions are affected by CVE-2026-53056?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53056?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-53056 being exploited?
There is no known exploitation of CVE-2026-53056 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53056, DEBIAN-CVE-2026-53056, GHSA-6p48-fhqh-r738, ROOT-OS-DEBIAN-11-CVE-2026-53056, ROOT-OS-DEBIAN-12-CVE-2026-53056, ROOT-OS-UBUNTU-2204-CVE-2026-53056 and 2 more.