CVE-2026-68087
Received Received - Intake

Use GFP_ATOMIC in wacom_wac_queue_flush() in Linux Kernel

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: HID: wacom: use GFP_ATOMIC in wacom_wac_queue_flush() wacom_wac_queue_flush() is called via the .raw_event callback (wacom_raw_event → wacom_wac_pen_serial_enforce → wacom_wac_queue_flush). For USB HID devices, this callback is invoked from hid_irq_in(), which is a URB completion handler running in atomic context. Using GFP_KERNEL in this path can sleep, leading to a "scheduling while atomic" bug. Use GFP_ATOMIC instead. The existing code already handles allocation failure by skipping the fifo entry and continuing.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68087
EUVD
EUVD-2026-55268

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wacom wacom *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is in the Linux kernel's HID driver for Wacom devices. The function wacom_wac_queue_flush() uses GFP_KERNEL for memory allocation, which can sleep. Since it is called from a USB HID interrupt handler (atomic context), this causes a 'scheduling while atomic' bug. The fix replaces GFP_KERNEL with GFP_ATOMIC to avoid sleeping in atomic context.

Detection Guidance

This vulnerability is specific to the Linux kernel's HID wacom driver and may not have direct network detection methods. Check kernel logs for 'scheduling while atomic' errors using dmesg | grep -i 'scheduling while atomic' or journalctl -k | grep -i 'scheduling while atomic'.

Impact Analysis

This vulnerability can cause system instability or crashes when using Wacom USB HID devices. The 'scheduling while atomic' bug may lead to kernel panics or unresponsive systems during device interaction.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for CVE-2026-68087. Monitor kernel updates from your distribution vendor and apply them promptly.

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