CVE-2026-80566

Touch-input denial of service via unchecked report indices

Published Aug 26, 2026 · Updated Aug 26, 2026

Denial of service in the hynitron_cstxxx touchscreen driver in Linux allows local users to interrupt touch input via crafted reports. The report parser uses an unchecked touch count to index its fixed buffer and accepts a finger ID equal to max_touch_num, so contact data updates the previously active slot without a valid slot change. Access to a Hynitron controller able to supply malformed reports is required, and the demonstrated consequence is corrupted or discarded touch input rather than a system crash.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the hynitron_cstxxx touchscreen driver in Linux allows local users to interrupt touch input via crafted reports. The report parser uses an unchecked touch count to index its fixed buffer and accepts a finger ID equal to max_touch_num, so contact data updates the previously active slot without a valid slot change. Access to a Hynitron controller able to supply malformed reports is required, and the demonstrated consequence is corrupted or discarded touch input rather than a system crash.

The record

CVE
CVE-2026-80566
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=6.2
  2. Affected versionversion=66603243f5283f7f28c795f09e7c2167233df0bd <27f380ef0e1d3de3cde114e02d33f9320ce3a5a6
  3. Affected versionversion=66603243f5283f7f28c795f09e7c2167233df0bd <387829ee60de26c7c073ed4e27ecfab2b75d4c74
  4. Affected versionversion=66603243f5283f7f28c795f09e7c2167233df0bd <38e7d5c1ade04b99c70da0298ca296ee62bc99c0
  5. Affected versionversion=66603243f5283f7f28c795f09e7c2167233df0bd <51c5503554c87e4de4035468bebf186205391ce9
  6. Affected versionversion=66603243f5283f7f28c795f09e7c2167233df0bd <ec61ca4e310665816a639cb2e46cd9b3af0a9bee

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=66603243f5283f7f28c795f09e7c2167233df0bd <27f380ef0e1d3de3cde114e02d33f9320ce3a5a6; version=66603243f5283f7f28c795f09e7c2167233df0bd <387829ee60de26c7c073ed4e27ecfab2b75d4c74; version=66603243f5283f7f28c795f09e7c2167233df0bd <38e7d5c1ade04b99c70da0298ca296ee62bc99c0; version=66603243f5283f7f28c795f09e7c2167233df0bd <51c5503554c87e4de4035468bebf186205391ce9; version=66603243f5283f7f28c795f09e7c2167233df0bd <ec61ca4e310665816a639cb2e46cd9b3af0a9bee

Published CVSS scores

5.5Red HatCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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