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Fencer Vulns
medium 4.7

CVE-2025-21685 json

platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: fix serdev race

published 2025-02-09 20 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-2634

cvss
4.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

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.

Patch / fix

  • Linux Linux 6.12.11, 6.13
  • linux Debian 14, Debian 13 6.12.11-1

debian advisories DEBIAN-CVE-2025-21685

  • linux-gcp-6.11 Ubuntu 24.04 LTS 6.11.0-1013.13~24.04.1
  • linux-hwe-6.11 Ubuntu 24.04 LTS 6.11.0-24.24~24.04.1
  • linux-oem-6.11 Ubuntu 24.04 LTS 6.11.0-1020.20
  • linux-azure-6.11 Ubuntu 24.04 LTS 6.11.0-1013.13~24.04.1
  • linux-nvidia-6.11 Ubuntu 24.04 LTS 6.11.0-1007.7
  • linux-lowlatency-hwe-6.11 Ubuntu 24.04 LTS 6.11.0-1012.13~24.04.1

ubuntu advisories UBUNTU-CVE-2025-21685

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-21685 updated cvss 4.4

kernel: platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: fix serdev race

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
13 mo ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.