CVE-2025-39752

Kernel hang via live-core trampoline rewrite

Published Sep 11, 2025 · Updated Sep 11, 2025

Race condition in Linux on RK3188 ARM systems allows local users to hang the kernel during symmetric multiprocessing initialization. In rockchip_smp_prepare_cpus(), the boot CPU copies secondary-core trampoline code into SRAM while secondary CPUs remain powered, so a secondary CPU can execute the code during the write. The condition is limited to Cortex-A9-based RK3188 multiprocessor startup and produces a rare boot hang without reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in Linux on RK3188 ARM systems allows local users to hang the kernel during symmetric multiprocessing initialization. In rockchip_smp_prepare_cpus(), the boot CPU copies secondary-core trampoline code into SRAM while secondary CPUs remain powered, so a secondary CPU can execute the code during the write. The condition is limited to Cortex-A9-based RK3188 multiprocessor startup and produces a rare boot hang without reported confidentiality or integrity impact.

The record

CVE
CVE-2025-39752
Published
Sep 11, 2025
Updated
Sep 11, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0223a3683d502b7e5eb2eb4ad7e97363fa88d531
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1eb67589a7e091b1e5108aab72fddbf4dc69af2c
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <265583266d93db4ff83d088819b1f63fdf0131db
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c6bf7a324b8995b9c7d790c8d2abf0668f51551
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47769dab9073a73e127aa0bfd0ba4c51eaccdc33
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7cdb433bb44cdc87dc5260cdf15bf03cc1cd1814
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <888a453c2a239765a7ab4de8a3cedae2e3802528
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0726d1e466e2d0da620836e293a59e6427ccdff
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7d6d076ee9532c4668f14696a35688d35dd16f4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0223a3683d502b7e5eb2eb4ad7e97363fa88d531; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1eb67589a7e091b1e5108aab72fddbf4dc69af2c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <265583266d93db4ff83d088819b1f63fdf0131db; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c6bf7a324b8995b9c7d790c8d2abf0668f51551; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47769dab9073a73e127aa0bfd0ba4c51eaccdc33; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7cdb433bb44cdc87dc5260cdf15bf03cc1cd1814; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <888a453c2a239765a7ab4de8a3cedae2e3802528; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0726d1e466e2d0da620836e293a59e6427ccdff; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d7d6d076ee9532c4668f14696a35688d35dd16f4

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo