CVE-2023-40091

Local privilege escalation via borrowed descriptor closure

Published Dec 4, 2023 · Updated Aug 2, 2024

Out-of-bounds write in Android IncidentService 11 through 14 allows local users to escalate privileges through a crafted Binder transaction. IncidentService::onTransact passes borrowed Parcel file descriptors to fdopen and later closes them, violating descriptor ownership and enabling reuse that corrupts memory. A low-privileged local process can reach the service without user interaction, and successful exploitation gains elevated privileges on the device.

CVSS severity7.8
High
EPSS probability0.13%
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 write in Android IncidentService 11 through 14 allows local users to escalate privileges through a crafted Binder transaction. IncidentService::onTransact passes borrowed Parcel file descriptors to fdopen and later closes them, violating descriptor ownership and enabling reuse that corrupts memory. A low-privileged local process can reach the service without user interaction, and successful exploitation gains elevated privileges on the device.

The record

CVE
CVE-2023-40091
Published
Dec 4, 2023
Updated
Aug 2, 2024
Vendor
Google
Product
Android
Classifications
CWE-787, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=12
  3. Affected versionversion=12L
  4. Affected versionversion=13
  5. Affected versionversion=14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google · Androidversion=11; version=12; version=12L; version=13; version=14

Published CVSS scores

7.8NVDCVSS: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.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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