CVE-2025-21685
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21685
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21685.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-21685
- Downstream
- Published
- 2025-02-09T12:15:29Z
- Modified
- 2025-10-01T20:18:20Z
- Severity
-
- 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: fix serdev race
The yt21380fcserdevprobe() function calls devmserdevdeviceopen() before setting the client ops via serdevdevicesetclientops(). This ordering can trigger a NULL pointer dereference in the serdev controller's receivebuf 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: crosecuart: properly fix race condition") where devmserdevdevice_open() was called before fully initializing the device.
Fix the race by ensuring client ops are set before enabling the port via devmserdevdevice_open().
Note, serdevdevicesetbaudrate() and serdevdevicesetflowcontrol() calls should be after the devmserdevdeviceopen() call.
- References