CVE-2020-10058

Local kernel privilege escalation via unchecked kscan pointers

Published May 11, 2020 · Updated Sep 17, 2024

Improper input validation in Zephyr RTOS 2.1.0 kscan syscalls allows local users to elevate from a user thread to kernel privileges. The z_vrfy_kscan_disable_callback and z_vrfy_kscan_enable_callback handlers pass an attacker-controlled device pointer to their implementations without verifying that it names an authorized kscan driver object. Exploitation requires code execution in a Zephyr user thread, CONFIG_USERSPACE, and a build containing the kscan subsystem; success grants kernel privileges.

CVSS severity7.8
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Zephyr RTOS 2.1.0 kscan syscalls allows local users to elevate from a user thread to kernel privileges. The z_vrfy_kscan_disable_callback and z_vrfy_kscan_enable_callback handlers pass an attacker-controlled device pointer to their implementations without verifying that it names an authorized kscan driver object. Exploitation requires code execution in a Zephyr user thread, CONFIG_USERSPACE, and a build containing the kscan subsystem; success grants kernel privileges.

The record

CVE
CVE-2020-10058
Published
May 11, 2020
Updated
Sep 17, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-20, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

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

  1. Affected versionversion=2.1.0 <unspecified

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=2.1.0 <unspecified

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8Zephyr ProjectCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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