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

CVE-2025-39752 is fixed in 9 products on 1 platform, first by DEBIAN-CVE-2025-39752, released September 11, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-39752
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 11, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39752

## 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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kernel-uek ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | kernel-uek-container ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | kernel-uek-debug ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | kernel-uek-devel ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | kernel-uek-doc ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | kernel-uek-tools ol 8 | 0:5.4.17-2136.348.3.el7uek | [ELSA-2025-20663](https://patchblox.com/security/data/fix/linux/elsa-2025-20663.md) | Oct 11, 2025 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.153-1 | [DEBIAN-CVE-2025-39752](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39752.md) | Sep 11, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.43-1 | [DEBIAN-CVE-2025-39752](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39752.md) | Sep 11, 2025 |
| Linux | linux Debian 14 | 6.16.3-1 | [DEBIAN-CVE-2025-39752](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39752.md) | Sep 11, 2025 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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