CVE-2026-99257
Received Received - Intake

GPIO NULL Pointer Dereference in Linux Kernel

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: kernel.org

Description
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.

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-99257
EUVD
EUVD-2026-115768

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
Linux Linux a060b8c511abb0997381b397e52149a5e3e5259a
Linux Linux a060b8c511abb0997381b397e52149a5e3e5259a
Linux Linux 6.19

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a NULL-pointer dereference issue when using platform lookup tables for shared GPIOs. The problem occurs when fwnode-based lookup is performed without an associated device, causing a crash. The kernel team added a check to handle this gracefully with an error instead of allowing the dereference.

Detection Guidance

This vulnerability is specific to the Linux kernel's GPIO subsystem and may not have direct network detection methods. Check kernel logs for NULL-pointer dereference errors related to GPIO operations using commands like 'dmesg | grep -i gpio' or 'journalctl -k | grep -i gpio'.

Impact Analysis

This vulnerability could cause system crashes or instability if shared GPIOs are accessed without a proper device association. It may lead to kernel panics or unexpected behavior in systems relying on GPIO functionality.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this issue. Monitor kernel updates from your distribution vendor and apply patches promptly. If immediate patching is not possible, avoid using shared GPIOs with platform lookup tables until the fix is applied.

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