Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.0.10 ACPI thermal zone driver probe null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k3.89

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.0.10. It has been rated as critical. This impacts the function probe of the component ACPI thermal zone driver. This manipulation causes null pointer dereference. This vulnerability appears as CVE-2026-64227. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.0.10 and classified as critical. Affected by this vulnerability is the function probe of the component ACPI thermal zone driver. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ACPI: driver: Check ACPI_COMPANION() against NULL during probe Since every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence. Accordingly, add requisite ACPI_COMPANION() or ACPI_HANDLE() checks against NULL to 13 platform drivers handling core ACPI devices. Also change the value returned by the ACPI thermal zone driver when the device's ACPI companion is not present to -ENODEV for consistency with the other drivers.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-64227 since 07/19/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/24/2026).

Upgrading to version 6.6.145, 6.12.97, 6.18.40 or 7.0.11 eliminates this vulnerability. Applying the patch f1e12d81f9cd250e722da01c7670b518d4181406/a9451bf561232314755baf69a5916e0ac77f33fc/34f4d0e4e5065237d15651df759a99e81b7f9f51/612ddab8fce04394bd7aebe8e0f2599642e30859/e4865a56d013e86e46ea6acea15bb6eae01898ff is able to eliminate this problem.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.145/6.12.97/6.18.40/7.0.11
Patch: f1e12d81f9cd250e722da01c7670b518d4181406/a9451bf561232314755baf69a5916e0ac77f33fc/34f4d0e4e5065237d15651df759a99e81b7f9f51/612ddab8fce04394bd7aebe8e0f2599642e30859/e4865a56d013e86e46ea6acea15bb6eae01898ff

Timelineinfo

07/19/2026 CVE reserved
07/24/2026 +5 days Advisory disclosed
07/24/2026 +0 days VulDB entry created
07/24/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64227 (🔒)
GCVE (CVE): GCVE-0-2026-64227
GCVE (VulDB): GCVE-100-382963

Entryinfo

Created: 07/24/2026 18:36
Changes: 07/24/2026 18:36 (59)
Complete: 🔍
Cache ID: 216::103

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