CVE-2021-47097

Stack disclosure and availability loss via undersized buffer

Published Mar 4, 2024 · Updated May 23, 2026

Out-of-bounds read in affected Linux kernel releases allows local users to expose kernel stack data and cause unspecified availability loss. elantech_change_report_id() allocates a two-byte param array, but elantech_read_reg_params() passes it to a three-byte PSMOUSE_CMD_GETINFO operation. Reachability requires the Elantech PS/2 mouse driver and compatible hardware during device detection; published evidence does not specify the exact availability failure or an attacker-controlled trigger.

CVSS severity7.1
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in affected Linux kernel releases allows local users to expose kernel stack data and cause unspecified availability loss. elantech_change_report_id() allocates a two-byte param array, but elantech_read_reg_params() passes it to a three-byte PSMOUSE_CMD_GETINFO operation. Reachability requires the Elantech PS/2 mouse driver and compatible hardware during device detection; published evidence does not specify the exact availability failure or an attacker-controlled trigger.

The record

CVE
CVE-2021-47097
Published
Mar 4, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 4, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.10.21 <5.10.89
  2. Affected versionversion=5.11
  3. Affected versionversion=5.4.103 <5.4.169
  4. Affected versionversion=9e4815cf178561104881e5d687ef69396aca1c8d <a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be
  5. Affected versionversion=dde807b4a44273fa5f62c0cb308295e6d6642550 <676c572439e58b7ee6b7ca3f1e5595382921045c
  6. Affected versionversion=e4c9062717feda88900b566463228d1c4910af6d <1d72d9f960ccf1052a0630a68c3d358791dbdaaa
  7. Affected versionversion=e4c9062717feda88900b566463228d1c4910af6d <dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10.21 <5.10.89; version=5.11; version=5.4.103 <5.4.169; version=9e4815cf178561104881e5d687ef69396aca1c8d <a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be; version=dde807b4a44273fa5f62c0cb308295e6d6642550 <676c572439e58b7ee6b7ca3f1e5595382921045c; version=e4c9062717feda88900b566463228d1c4910af6d <1d72d9f960ccf1052a0630a68c3d358791dbdaaa; version=e4c9062717feda88900b566463228d1c4910af6d <dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
6.0Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-125Out-of-bounds Read

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

See the directory against your own environment.

Your stack

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