CVE-2021-47083

Kernel disclosure or crash via unchecked EINT index

Published Mar 4, 2024 · Updated Aug 5, 2026

Out-of-bounds read in the Linux MediaTek pinctrl driver allows local users to disclose kernel memory or crash the system via EINT mapping. The mtk_xt_get_gpio_n function indexes desc[eint_n] before ensuring that the EINT number is below the GPIO count. Reachability requires local low-privilege access and a system using the affected MediaTek pinctrl implementation; consequences are limited to kernel-memory disclosure and service interruption.

CVSS severity7.1
High
EPSS probability0.23%
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 the Linux MediaTek pinctrl driver allows local users to disclose kernel memory or crash the system via EINT mapping. The mtk_xt_get_gpio_n function indexes desc[eint_n] before ensuring that the EINT number is below the GPIO count. Reachability requires local low-privilege access and a system using the affected MediaTek pinctrl implementation; consequences are limited to kernel-memory disclosure and service interruption.

The record

CVE
CVE-2021-47083
Published
Mar 4, 2024
Updated
Aug 5, 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. Aug 5, 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=4.20
  2. Affected versionversion=fb5fa8dc151b2364c975a9070eedb28a354a995a <2d5446da5acecf9c67db1c9d55ae2c3e5de01f8d
  3. Affected versionversion=fb5fa8dc151b2364c975a9070eedb28a354a995a <441d3873664d170982922c5d2fc01fa89d9439ed
  4. Affected versionversion=fb5fa8dc151b2364c975a9070eedb28a354a995a <f373298e1bf0c6ea097c0bcc558dc43ad53e421f
  5. Affected versionversion=fb5fa8dc151b2364c975a9070eedb28a354a995a <fb563baa3eb8e7a15f2cff3c2695e2cca0493e69

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=fb5fa8dc151b2364c975a9070eedb28a354a995a <2d5446da5acecf9c67db1c9d55ae2c3e5de01f8d; version=fb5fa8dc151b2364c975a9070eedb28a354a995a <441d3873664d170982922c5d2fc01fa89d9439ed; version=fb5fa8dc151b2364c975a9070eedb28a354a995a <f373298e1bf0c6ea097c0bcc558dc43ad53e421f; version=fb5fa8dc151b2364c975a9070eedb28a354a995a <fb563baa3eb8e7a15f2cff3c2695e2cca0493e69

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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Your stack

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