Bug 2394638 (CVE-2025-39752) - CVE-2025-39752 kernel: ARM: rockchip: fix kernel hang during smp initialization
Summary: CVE-2025-39752 kernel: ARM: rockchip: fix kernel hang during smp initialization
Keywords:
Status: NEW
Alias: CVE-2025-39752
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-09-11 17:04 UTC by OSIDB Bzimport
Modified: 2025-09-11 19:00 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2025-09-11 17:04:00 UTC
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


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