CVE-2023-4134

System crash via rearmed touchscreen watchdog timer

Published Nov 14, 2024 · Updated Nov 14, 2024

Use-after-free in the Linux kernel cyttsp4_core driver before 6.5 allows local users to crash the system during device removal. In cyttsp4_remove(), timer and work cancellation can finish while cyttsp4_watchdog_work() rearms watchdog_timer, leaving queued work to dereference freed driver state. Triggering the race requires physical access or privileges to remove or unbind an affected Cypress touchscreen device; the established consequence is a system crash.

CVSS severity5.5
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

Use-after-free in the Linux kernel cyttsp4_core driver before 6.5 allows local users to crash the system during device removal. In cyttsp4_remove(), timer and work cancellation can finish while cyttsp4_watchdog_work() rearms watchdog_timer, leaving queued work to dereference freed driver state. Triggering the race requires physical access or privileges to remove or unbind an affected Cypress touchscreen device; the established consequence is a system crash.

The record

CVE
CVE-2023-4134
Published
Nov 14, 2024
Updated
Nov 14, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5Fedora ProjectCVSS:3.1/AV:L/AC:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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