CVE-2026-53056

In the Linux kernel, the following vulnerability has been resolved:

drm/msm/dpu: fix mismatch between power and frequency

During DPU runtime suspend, calling devpmoppsetrate(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: devsyncstate -> rpmhpdsyncstate cpu1: dpukmshw_init timeline 0 ------------------------------------------------> t

After rpmhpdsyncstate, the voltage performance is no longer guaranteed to stay at the highest level. During dpukmshwinit, calling devpmoppsetrate(dev, 0) drops the voltage, causing the MMCX rail to fall to MINSVS 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 devpmoppsetrate(dev, 0) from dpuruntimesuspend to ensure the correct vote is restored when DPU resumes.

Patchwork: https://patchwork.freedesktop.org/patch/710077/