Linux Kernel up to 7.2.12 Gpio Shared null pointer dereference

Summaryinfo

A vulnerability has been found in Linux Kernel up to 7.2.12 and classified as critical. Impacted is an unknown function of the component Gpio Shared. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2026-99257. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 7.2.12. Affected by this vulnerability is an unknown part of the component Gpio Shared. 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. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: gpio: shared: gracefully handle no-device lookup of shared GPIOs We use platform lookup tables for shared GPIOs. This mechanism needs a struct device to work so fwnode-based lookup with no device associated currently causes a NULL-pointer deference. Adding this functionality will require a larger rework and it has never worked anyway so add a check that allows the kernel to gracefully handle this situation with an error ahead of implementing that functionality as a new feature.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-99257 since 09/25/2026. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/03/2026).

Upgrading to version 7.2.13 eliminates this vulnerability. Applying the patch 7f9eb6aaf9a3ab7fa2b7dcc38660c27db12d4ec1/cf73c3fc03c43a8a86fd487c62390b4744eff9ec is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.9
• 7.2.10
• 7.2.11
• 7.2.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

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