Linux Kernel up to 6.18.12 Classmate Laptop Driver cmpc_accel_sensitivity_store_v4 null pointer dereference

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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.12 and classified as critical. This affects the function cmpc_accel_sensitivity_store_v4 of the component Classmate Laptop Driver. Executing a manipulation can lead to null pointer dereference. This vulnerability is registered as CVE-2026-23237. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.12. It has been declared as critical. This vulnerability affects the function cmpc_accel_sensitivity_store_v4 of the component Classmate Laptop 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 availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: platform/x86: classmate-laptop: Add missing NULL pointer checks In a few places in the Classmate laptop driver, code using the accel object may run before that object's address is stored in the driver data of the input device using it. For example, cmpc_accel_sensitivity_store_v4() is the "show" method of cmpc_accel_sensitivity_attr_v4 which is added in cmpc_accel_add_v4(), before calling dev_set_drvdata() for inputdev->dev. If the sysfs attribute is accessed prematurely, the dev_get_drvdata(&inputdev->dev) call in in cmpc_accel_sensitivity_store_v4() returns NULL which leads to a NULL pointer dereference going forward. Moreover, sysfs attributes using the input device are added before initializing that device by cmpc_add_acpi_notify_device() and if one of them is accessed before running that function, a NULL pointer dereference will occur. For example, cmpc_accel_sensitivity_attr_v4 is added before calling cmpc_add_acpi_notify_device() and if it is read prematurely, the dev_get_drvdata(&acpi->dev) call in cmpc_accel_sensitivity_show_v4() returns NULL which leads to a NULL pointer dereference going forward. Fix this by adding NULL pointer checks in all of the relevant places.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-23237 since 01/13/2026. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 301082 (Linux Distros Unpatched Vulnerability : CVE-2026-23237), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.251, 5.15.201, 6.1.164, 6.6.127, 6.12.74 or 6.18.13 eliminates this vulnerability. Applying the patch 993708fc18d0d0919db438361b4e8c1f980a8d1b/af673209d43b46257540997aba042b90ef3258c0/eb214804f03c829decf10998e9b7dd26f4c8ab9e/9cf4b9b8ad09d6e05307abc4e951cabdff4be652/da6e06a5fdbabea3870d18c227734b5dea5b3be6/97528b1622b8f129574d29a571c32a3c85eafa3c/fe747d7112283f47169e9c16e751179a9b38611e is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (301082), EUVD (EUVD-2026-9409) and CERT Bund (WID-SEC-2026-0614). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • Open Source Linux Kernel
  • IBM QRadar SIEM

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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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: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 301082
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23237

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.251/5.15.201/6.1.164/6.6.127/6.12.74/6.18.13
Patch: 993708fc18d0d0919db438361b4e8c1f980a8d1b/af673209d43b46257540997aba042b90ef3258c0/eb214804f03c829decf10998e9b7dd26f4c8ab9e/9cf4b9b8ad09d6e05307abc4e951cabdff4be652/da6e06a5fdbabea3870d18c227734b5dea5b3be6/97528b1622b8f129574d29a571c32a3c85eafa3c/fe747d7112283f47169e9c16e751179a9b38611e

Timelineinfo

01/13/2026 CVE reserved
03/04/2026 +50 days Advisory disclosed
03/04/2026 +0 days VulDB entry created
06/24/2026 +112 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23237 (🔒)
GCVE (CVE): GCVE-0-2026-23237
GCVE (VulDB): GCVE-100-348730
EUVD: 🔒
CERT Bund: WID-SEC-2026-0614 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/04/2026 16:06
Updated: 06/24/2026 07:50
Changes: 03/04/2026 16:06 (59), 03/04/2026 18:02 (1), 03/05/2026 14:09 (7), 03/07/2026 22:18 (2), 03/18/2026 06:43 (11), 04/20/2026 11:35 (1), 04/29/2026 22:59 (1), 06/24/2026 07:50 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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