CVE-2026-23237: Linux kernel · platform/x86: classmate-laptop: Add missing NULL pointer checks
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fe747d7112283f47169e9c16e751179a9b38611e : update Linux kernel when convenient.
Data as of 5 Nov 2026, 21:34 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-05.
- Patch
- Available – fixed in fe747d7112283f47169e9c16e751179a9b38611e, eb214804f03c829decf10998e9b7dd26f4c8ab9e, da6e06a5fdbabea3870d18c227734b5dea5b3be6 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Description
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.
References
- git.kernel.org/stable/c/993708fc18d0d0919db438361b4e8c1f980a8d1b (opens in a new tab)
- git.kernel.org/stable/c/af673209d43b46257540997aba042b90ef3258c0 (opens in a new tab)
- git.kernel.org/stable/c/eb214804f03c829decf10998e9b7dd26f4c8ab9e (opens in a new tab)
- git.kernel.org/stable/c/9cf4b9b8ad09d6e05307abc4e951cabdff4be652 (opens in a new tab)
- git.kernel.org/stable/c/da6e06a5fdbabea3870d18c227734b5dea5b3be6 (opens in a new tab)
- git.kernel.org/stable/c/97528b1622b8f129574d29a571c32a3c85eafa3c (opens in a new tab)
- git.kernel.org/stable/c/fe747d7112283f47169e9c16e751179a9b38611e (opens in a new tab)