CVE-2023-53059

Kernel-data disclosure via oversized EC ioctl input

Published May 2, 2025 · Updated May 11, 2026

Information disclosure in the Linux cros_ec_chardev driver allows local users to read kernel page data through an EC command ioctl. The ioctl path allocates an uninitialized command buffer sized by insize and copies the requested response length back even when the EC fills fewer bytes. Reachability requires local access to the ChromeOS EC character device and permission to issue host commands; each call can expose residual kernel-page bytes.

CVSS severity7.1
High
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

Information disclosure in the Linux cros_ec_chardev driver allows local users to read kernel page data through an EC command ioctl. The ioctl path allocates an uninitialized command buffer sized by insize and copies the requested response length back even when the EC fills fewer bytes. Reachability requires local access to the ChromeOS EC character device and permission to issue host commands; each call can expose residual kernel-page bytes.

The record

CVE
CVE-2023-53059
Published
May 2, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.4
  2. Affected versionversion=eda2e30c6684d67288edb841c6125d48c608a242 <13493ad6a220cb3f6f3552a16b4f2753a118b633
  3. Affected versionversion=eda2e30c6684d67288edb841c6125d48c608a242 <a0d8644784f73fa39f57f72f374eefaba2bf48a0
  4. Affected versionversion=eda2e30c6684d67288edb841c6125d48c608a242 <b20cf3f89c56b5f6a38b7f76a8128bf9f291bbd3
  5. Affected versionversion=eda2e30c6684d67288edb841c6125d48c608a242 <eab28bfafcd1245a3510df9aa9eb940589956ea6
  6. Affected versionversion=eda2e30c6684d67288edb841c6125d48c608a242 <ebea2e16504f40d2c2bac42ad5c5a3de5ce034b4
  7. Affected versionversion=eda2e30c6684d67288edb841c6125d48c608a242 <f86ff88a1548ccf5a13960c0e7625ca787ea0993

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=eda2e30c6684d67288edb841c6125d48c608a242 <13493ad6a220cb3f6f3552a16b4f2753a118b633; version=eda2e30c6684d67288edb841c6125d48c608a242 <a0d8644784f73fa39f57f72f374eefaba2bf48a0; version=eda2e30c6684d67288edb841c6125d48c608a242 <b20cf3f89c56b5f6a38b7f76a8128bf9f291bbd3; version=eda2e30c6684d67288edb841c6125d48c608a242 <eab28bfafcd1245a3510df9aa9eb940589956ea6; version=eda2e30c6684d67288edb841c6125d48c608a242 <ebea2e16504f40d2c2bac42ad5c5a3de5ce034b4; version=eda2e30c6684d67288edb841c6125d48c608a242 <f86ff88a1548ccf5a13960c0e7625ca787ea0993

Published CVSS scores

7.1UbuntuCVSS: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 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

T1005Data from Local System

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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