CVE-2025-21695
In the Linux kernel, the following vulnerability has been resolved: platform/x86: dell-uart-backlight: fix serdev race The dell_uart_bl_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.
- Score
- CVSS 3.1 4.7 Medium
- Status
- Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- Published
- 2025-02-12
- Last modified
- 2026-05-11
- Weaknesses
- CWE-476
Affected products
References
- https://git.kernel.org/stable/c/1b2128aa2d45ab20b22548dcf4b48906298ca7fd
- https://git.kernel.org/stable/c/d3a24d923333f75aaece9acb051d676edc0afb75
