CVE-2025-21685: platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: fix serdev race
First published: Sun Feb 09 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: fix serdev race The yt2_1380_fc_serdev_probe() function calls devm_serdev_device_open() before setting the client ops via serdev_device_set_client_ops(). This ordering can trigger a NULL pointer dereference in the serdev controller's receive_buf handler, as it assumes serdev->ops is valid when SERPORT_ACTIVE is set. This is similar to the issue fixed in commit 5e700b384ec1 ("platform/chrome: cros_ec_uart: properly fix race condition") where devm_serdev_device_open() was called before fully initializing the device. Fix the race by ensuring client ops are set before enabling the port via devm_serdev_device_open(). Note, serdev_device_set_baudrate() and serdev_device_set_flow_control() calls should be after the devm_serdev_device_open() call.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=6.10<6.12.11 | |
| Linux Kernel | =6.13-rc1 | |
| Linux Kernel | =6.13-rc2 | |
| Linux Kernel | =6.13-rc3 | |
| Linux Kernel | =6.13-rc4 | |
| Linux Kernel | =6.13-rc5 | |
| Linux Kernel | =6.13-rc6 | |
| Linux Kernel | =6.13-rc7 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-21685?
CVE-2025-21685 has been classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2025-21685?
To fix CVE-2025-21685, ensure you update to the latest Linux kernel version that contains the patch for this vulnerability.
What systems are affected by CVE-2025-21685?
CVE-2025-21685 affects the Linux kernel, particularly relevant to the Lenovo Yoga Tab 2 Pro 1380.
What kind of vulnerability is CVE-2025-21685?
CVE-2025-21685 is a race condition vulnerability related to the handling of serdev devices in the Linux kernel.
Is CVE-2025-21685 being actively exploited?
As of now, there have been no reports indicating that CVE-2025-21685 is being actively exploited in the wild.
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