CVE-2025-21746

Kernel crash via premature pass-through interrupt

Published Feb 27, 2025 · Updated May 11, 2026

Race condition in the synaptics input driver in Linux allows local users to crash the kernel by enabling a pass-through port. The pass-through interrupt handler accesses the associated psmouse instance before the driver has attached that instance to the serio port. Exploitation requires local access and compatible Synaptics hardware, and the resulting impact is a host service interruption.

CVSS severity4.7
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the synaptics input driver in Linux allows local users to crash the kernel by enabling a pass-through port. The pass-through interrupt handler accesses the associated psmouse instance before the driver has attached that instance to the serio port. Exploitation requires local access and compatible Synaptics hardware, and the resulting impact is a host service interruption.

The record

CVE
CVE-2025-21746
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 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=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <08bd5b7c9a2401faabdaa1472d45c7de0755fd7e
  2. Affected versionversion=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <3e179d3f1ada963475395d81bfe91daef4d1a24c
  3. Affected versionversion=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <87da1ea93ec9f9f0004e5b12e78789bc94e360bf
  4. Affected versionversion=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <a2cbcd70133dc0d4d4c95ad4cd5412b935354c7c
  5. Affected versionversion=6.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <08bd5b7c9a2401faabdaa1472d45c7de0755fd7e; version=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <3e179d3f1ada963475395d81bfe91daef4d1a24c; version=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <87da1ea93ec9f9f0004e5b12e78789bc94e360bf; version=100e16959c3ca8cb7be788ed3e2c5867481f35f6 <a2cbcd70133dc0d4d4c95ad4cd5412b935354c7c; version=6.5

Published CVSS scores

4.7NIST NVDCVSS: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-367Time-of-check Time-of-use (TOCTOU) Race Condition
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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