CVE-2025-68822 Linux CVE debrief

Who should care

Linux kernel developers and users who use the ALPS touchpad driver should be aware of this vulnerability and take steps to mitigate it. This includes applying the patches provided by the vendor or disabling the ALPS touchpad driver if not needed. Additionally, defenders should monitor for suspicious activity related to the ALPS touchpad driver and review compensating controls for exposed systems.

Technical summary

The dev3_register_work delayed work item was not properly canceled during device detachment, allowing it to be scheduled after the alps_data structure had been deallocated. This can cause a use-after-free vulnerability in the Linux kernel's ALPS touchpad driver. The vulnerability can be mitigated by applying the patches provided by the vendor or disabling the ALPS touchpad driver if not needed. The vulnerability was identified by static analysis of the Linux kernel's ALPS touchpad driver code. The analysis revealed that the dev3_register_work delayed work item was not properly canceled during device detachment, allowing it to be scheduled after the alps_data structure had been deallocated. Defenders should verify that the ALPS touchpad driver is properly updated and configured, and monitor for suspicious activity related to the driver.

Defensive priority

High

Recommended defensive actions

• Apply the patch from https://git.kernel.org/stable/c/a9c115e017b2c633d25bdfe6709dda6fc36f08c2
• Apply the patch from https://git.kernel.org/stable/c/bf40644ef8c8a288742fa45580897ed0e0289474
• Apply the patch from https://git.kernel.org/stable/c/ed8c61b89be0c45f029228b2913d5cf7b5cda1a7
• Disable the ALPS touchpad driver if not needed
• Monitor for suspicious activity related to the ALPS touchpad driver
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability was identified by static analysis of the Linux kernel's ALPS touchpad driver code. The analysis revealed that the dev3_register_work delayed work item was not properly canceled during device detachment, allowing it to be scheduled after the alps_data structure had been deallocated. This can cause a use-after-free vulnerability. Defenders should verify that the ALPS touchpad driver is properly updated and configured, and monitor for suspicious activity related to the driver.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.