The Linux kernel contains a flaw on Spacemit K3 platforms where the HDMA clock, which controls the internal TCM access path of the X100 RISC‑V core, is not marked as critical by default. When the clock is turned off, a page fault can be triggered during a vector instruction access, causing the kernel to hang and the entire system to stop. This leads to a denial‑of‑service condition with no data loss but a complete loss of availability.

Linux kernel builds compiled for the Spacemit K3 hardware configuration are affected. Any kernel that does not include the recent commit which marks the HDMA clock as critical can potentially suffer this issue. No specific kernel release numbers are enumerated, so the problem may exist across multiple kernel versions targeting this platform.

The CVSS score is 7.1, reflecting a medium to high severity that indicates a significant denial‑of‑service impact if exploited. The EPSS score is < 1%, indicating a very low probability of exploitation. The vulnerability is not listed in CISA KEV, which means no known public exploits. Exploitation would require local or low‑level kernel access to disable the HDMA clock; remote exploitation without prior compromise is unlikely. Thus the risk is limited to environments with physical access or where privilege escalation to kernel level is possible.