CVE-2025-38633

/// Technical description

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

clk: spacemit: mark K1 pll1_d8 as critical

The pll1_d8 clock is enabled by the boot loader, and is ultimately a

parent for numerous clocks, including those used by APB and AXI buses.

Guodong Xu discovered that this clock got disabled while responding to

getting -EPROBE_DEFER when requesting a reset controller.

The needed clock (CLK_DMA, along with its parents) had already been

enabled. To respond to the probe deferral return, the CLK_DMA clock

was disabled, and this led to parent clocks also reducing their enable

count. When the enable count for pll1_d8 was decremented it became 0,

which caused it to be disabled. This led to a system hang.

Marking that clock critical resolves this by preventing it from being

disabled.

Define a new macro CCU_FACTOR_GATE_DEFINE() to allow clock flags to

be supplied for a CCU_FACTOR_GATE clock.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References