CVE-2025-39936

Kernel crash via NULL error pointer dereference

Published Oct 4, 2025 · Updated Oct 4, 2025

NULL-pointer dereference in the CCP driver in Linux 6.16 allows local users to crash the kernel during suspend-to-disk shutdown. The __sev_firmware_shutdown function passes NULL to __sev_platform_shutdown_locked, which dereferences the missing error pointer while reporting shutdown failure. Reaching the path requires root or CAP_SYS_ADMIN access to initiate hibernation or power-off, and the bounded consequence is a kernel Oops and service interruption.

CVSS severity5.5
Medium
EPSS probability0.14%
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 CCP driver in Linux 6.16 allows local users to crash the kernel during suspend-to-disk shutdown. The __sev_firmware_shutdown function passes NULL to __sev_platform_shutdown_locked, which dereferences the missing error pointer while reporting shutdown failure. Reaching the path requires root or CAP_SYS_ADMIN access to initiate hibernation or power-off, and the bounded consequence is a kernel Oops and service interruption.

The record

CVE
CVE-2025-39936
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
admin

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=6.16
  2. Affected versionversion=9770b428b1a28360663f1f5e524ee458b4cf454b <46834d90a9a13549264b9581067d8f746b4b36cc
  3. Affected versionversion=9770b428b1a28360663f1f5e524ee458b4cf454b <bc509293c9d4f4f74e776f4a0bbb61f63c041938

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.16; version=9770b428b1a28360663f1f5e524ee458b4cf454b <46834d90a9a13549264b9581067d8f746b4b36cc; version=9770b428b1a28360663f1f5e524ee458b4cf454b <bc509293c9d4f4f74e776f4a0bbb61f63c041938

Published CVSS scores

5.5UbuntuCVSS: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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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