CVE-2026-68087 HID: wacom: use GFP_ATOMIC in wacom_wac_queue_flush()
A local attacker with physical access to a Wacom device can cause a kernel crash by triggering a scheduling while atomic bug in the HID driver.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68087?
CVE-2026-68087 is a denial of service vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-68087?
How do I fix CVE-2026-68087?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-68087 being exploited?
There is no known exploitation of CVE-2026-68087 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68087, DEBIAN-CVE-2026-68087, GHSA-m5p4-pw2f-ch5c, UBUNTU-CVE-2026-68087.