CVE-2023-40100

Local privilege escalation via detached DNS64 thread

Published Feb 15, 2024 · Updated Aug 28, 2024

A use-after-free in the DNS Resolver in Google Android 11 through 14 allows local users to gain elevated privileges. A detached discovery_thread retains a raw Dns64Configuration pointer after dnsresolver destruction frees the referenced instance and resources. Exploitation requires local code execution but no additional privileges or user interaction, and successful memory corruption grants elevated privileges.

CVSS severity7.8
High
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in the DNS Resolver in Google Android 11 through 14 allows local users to gain elevated privileges. A detached discovery_thread retains a raw Dns64Configuration pointer after dnsresolver destruction frees the referenced instance and resources. Exploitation requires local code execution but no additional privileges or user interaction, and successful memory corruption grants elevated privileges.

The record

CVE
CVE-2023-40100
Published
Feb 15, 2024
Updated
Aug 28, 2024
Vendor
Google
Product
Android
Classifications
CWE-416, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=11
  2. Affected versionversion=11.0
  3. Affected versionversion=12
  4. Affected versionversion=12.0
  5. Affected versionversion=12l
  6. Affected versionversion=12L
  7. Affected versionversion=13
  8. Affected versionversion=13.0
  9. Affected versionversion=14
  10. Affected versionversion=14.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Google · Androidversion=11; version=11.0; version=12; version=12.0; version=12l; version=12L; version=13; version=13.0; version=14; version=14.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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