Linux Kernel Classmate Laptop Driver Null Pointer Deref
CVE-2026-23237 Published on March 4, 2026
platform/x86: classmate-laptop: Add missing NULL pointer checks
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.
Products Associated with CVE-2026-23237
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 993708fc18d0d0919db438361b4e8c1f980a8d1b is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below af673209d43b46257540997aba042b90ef3258c0 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below eb214804f03c829decf10998e9b7dd26f4c8ab9e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 9cf4b9b8ad09d6e05307abc4e951cabdff4be652 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below da6e06a5fdbabea3870d18c227734b5dea5b3be6 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 97528b1622b8f129574d29a571c32a3c85eafa3c is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below fe747d7112283f47169e9c16e751179a9b38611e is affected.
- Version 5.10.251, <= 5.10.* is unaffected.
- Version 5.15.201, <= 5.15.* is unaffected.
- Version 6.1.164, <= 6.1.* is unaffected.
- Version 6.6.127, <= 6.6.* is unaffected.
- Version 6.12.74, <= 6.12.* is unaffected.
- Version 6.18.13, <= 6.18.* is unaffected.
- Version 6.19, <= * is unaffected.