CVE-2025-21685

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Source
https://nvd.nist.gov/vuln/detail/CVE-2025-21685
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21685.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21685
Downstream
Published
2025-02-09T11:37:25Z
Modified
2025-10-17T20:56:55.701094Z
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
platform/x86: lenovo-yoga-tab2-pro-1380-fastcharger: fix serdev race
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

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
b2ed33e8d486ab2f1920131dd76fab38c8ef3550
Fixed
3f67e07873df3c6d9ce2582260b83732e1d3a40b
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
b2ed33e8d486ab2f1920131dd76fab38c8ef3550
Fixed
59616a91e5e74833b2008b56c66879857c616006

Affected versions

v6.*

v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.12.10
v6.12.2
v6.12.3
v6.12.4
v6.12.5
v6.12.6
v6.12.7
v6.12.8
v6.12.9
v6.13-rc1
v6.9
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7

Database specific

vanir_signatures

[
    {
        "signature_type": "Line",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@59616a91e5e74833b2008b56c66879857c616006",
        "digest": {
            "line_hashes": [
                "77659742949687059652305711471105783550",
                "277435500250892428819230993705980499140",
                "338909915558777175192928751086602498625",
                "165648129539787129017015306046521104360",
                "224957815455914514098903457669681490697",
                "180939764710325794071205074071323198531",
                "5121672561304629556668492821595574643",
                "186243188063654578034906395551038367387",
                "267364344792848107311230067103711589888",
                "293921938673857249084014523157528997975"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2025-21685-8099ed53",
        "signature_version": "v1",
        "target": {
            "file": "drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c"
        }
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3f67e07873df3c6d9ce2582260b83732e1d3a40b",
        "digest": {
            "length": 1796.0,
            "function_hash": "170354666520807760678725390286979842380"
        },
        "id": "CVE-2025-21685-b0f07065",
        "signature_version": "v1",
        "target": {
            "function": "yt2_1380_fc_serdev_probe",
            "file": "drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c"
        }
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3f67e07873df3c6d9ce2582260b83732e1d3a40b",
        "digest": {
            "line_hashes": [
                "77659742949687059652305711471105783550",
                "277435500250892428819230993705980499140",
                "338909915558777175192928751086602498625",
                "165648129539787129017015306046521104360",
                "224957815455914514098903457669681490697",
                "180939764710325794071205074071323198531",
                "5121672561304629556668492821595574643",
                "186243188063654578034906395551038367387",
                "267364344792848107311230067103711589888",
                "293921938673857249084014523157528997975"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2025-21685-b18ede28",
        "signature_version": "v1",
        "target": {
            "file": "drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c"
        }
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@59616a91e5e74833b2008b56c66879857c616006",
        "digest": {
            "length": 1796.0,
            "function_hash": "170354666520807760678725390286979842380"
        },
        "id": "CVE-2025-21685-b2efc6c1",
        "signature_version": "v1",
        "target": {
            "function": "yt2_1380_fc_serdev_probe",
            "file": "drivers/platform/x86/lenovo-yoga-tab2-pro-1380-fastcharger.c"
        }
    }
]

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.10.0
Fixed
6.12.11