CVE-2025-21685

Local system crash via serdev initialization race

Published Feb 9, 2025 · Updated May 11, 2026

A serdev race in Linux kernel 6.10 through 6.12.10 and 6.13 release candidates allows local users to crash affected tablets. yt2_1380_fc_serdev_probe opens the serdev device before installing client operations, so receive_buf can dereference a null serdev->ops pointer after SERPORT_ACTIVE is set. Low-privileged local access and the affected Lenovo tablet's fast-charger hardware are required, and the demonstrated consequence is a kernel crash.

CVSS severity4.7
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A serdev race in Linux kernel 6.10 through 6.12.10 and 6.13 release candidates allows local users to crash affected tablets. yt2_1380_fc_serdev_probe opens the serdev device before installing client operations, so receive_buf can dereference a null serdev->ops pointer after SERPORT_ACTIVE is set. Low-privileged local access and the affected Lenovo tablet's fast-charger hardware are required, and the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2025-21685
Published
Feb 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.10
  2. Affected versionversion=b2ed33e8d486ab2f1920131dd76fab38c8ef3550 <3f67e07873df3c6d9ce2582260b83732e1d3a40b
  3. Affected versionversion=b2ed33e8d486ab2f1920131dd76fab38c8ef3550 <59616a91e5e74833b2008b56c66879857c616006

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=b2ed33e8d486ab2f1920131dd76fab38c8ef3550 <3f67e07873df3c6d9ce2582260b83732e1d3a40b; version=b2ed33e8d486ab2f1920131dd76fab38c8ef3550 <59616a91e5e74833b2008b56c66879857c616006

Published CVSS scores

4.7NISTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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