CVE-2025-39937

Local kernel crash via uninitialized rfkill type pointer

Published Oct 4, 2025 · Updated Oct 4, 2025

NULL pointer dereference in the Linux kernel allows local users to crash affected x86 systems during rfkill-gpio device binding. A failed device_property_read_string call leaves type_name uninitialized, and rfkill_find_type then consumes the invalid pointer. Reachability requires a BCM4752 or LNV4752 ACPI device without a type property; the reported consequence is a kernel crash without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel allows local users to crash affected x86 systems during rfkill-gpio device binding. A failed device_property_read_string call leaves type_name uninitialized, and rfkill_find_type then consumes the invalid pointer. Reachability requires a BCM4752 or LNV4752 ACPI device without a type property; the reported consequence is a kernel crash without data disclosure or modification.

The record

CVE
CVE-2025-39937
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=4.6
  2. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <184f608a68f96794e8fe58cd5535014d53622cde
  3. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d
  4. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <21ba85d9d508422ca9e6698463ff9357c928c22d
  5. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <47ade5f9d70b23a119ec20b1c6504864b2543a79
  6. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <689aee35ce671aab752f159e5c8e66d7685e6887
  7. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <8793e7a8e1b60131a825457174ed6398111daeb7
  8. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <ada2282259243387e6b6e89239aeb4897e62f051
  9. Affected versionversion=7d5e9737efda16535e5b54bd627ef4881d11d31f <b6f56a44e4c1014b08859dcf04ed246500e310e5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.6; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <184f608a68f96794e8fe58cd5535014d53622cde; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <21a39b958b4bcf44f7674bfbbe1bbb8cad0d842d; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <21ba85d9d508422ca9e6698463ff9357c928c22d; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <47ade5f9d70b23a119ec20b1c6504864b2543a79; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <689aee35ce671aab752f159e5c8e66d7685e6887; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <8793e7a8e1b60131a825457174ed6398111daeb7; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <ada2282259243387e6b6e89239aeb4897e62f051; version=7d5e9737efda16535e5b54bd627ef4881d11d31f <b6f56a44e4c1014b08859dcf04ed246500e310e5

Published CVSS scores

5.5NVDCVSS: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.

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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

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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

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Your stack

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