CVE-2023-21158

Local memory disclosure via heap over-read

Published Jun 28, 2023 · Updated Dec 3, 2024

Out-of-bounds read in Google Pixel exynos-ril on Android kernel builds allows local users with System privileges to disclose memory. The encode function in miscdata.cpp reads beyond a heap-buffer boundary while processing data, exposing adjacent memory contents. System access is the reachability gate; exploitation needs no user interaction and has no reported integrity or availability effect.

CVSS severity4.4
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in Google Pixel exynos-ril on Android kernel builds allows local users with System privileges to disclose memory. The encode function in miscdata.cpp reads beyond a heap-buffer boundary while processing data, exposing adjacent memory contents. System access is the reachability gate; exploitation needs no user interaction and has no reported integrity or availability effect.

The record

CVE
CVE-2023-21158
Published
Jun 28, 2023
Updated
Dec 3, 2024
Vendor
Google
Product
Google Pixel
Classifications
CWE-125
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 3, 2024Record 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=Android kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google · Google Pixelversion=Android kernel

Published CVSS scores

4.4NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

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
Privilegesadmin
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

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo