CVE-2022-20509

Local privilege escalation via malformed grantor mapping

Published Dec 16, 2022 · Updated Apr 21, 2025

Out-of-bounds write in Android 13 System allows local users with System execution privileges to escalate privileges without user interaction. MessageQueueBase::mapGrantorDescr uses unvalidated grantor fdIndex and extent values when selecting a native-handle file descriptor and calculating the shared-memory mapping length. A local user already executing with System privileges can supply a malformed grantor descriptor, causing memory corruption that enables higher-privilege execution.

CVSS severity6.7
Medium
EPSS probability0.17%
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 13 System allows local users with System execution privileges to escalate privileges without user interaction. MessageQueueBase::mapGrantorDescr uses unvalidated grantor fdIndex and extent values when selecting a native-handle file descriptor and calculating the shared-memory mapping length. A local user already executing with System privileges can supply a malformed grantor descriptor, causing memory corruption that enables higher-privilege execution.

The record

CVE
CVE-2022-20509
Published
Dec 16, 2022
Updated
Apr 21, 2025
Vendor
Google Cloud
Product
Android
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=Android-13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google Cloud · Androidversion=Android-13

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/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
Privilegesadmin
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.

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Technologies

Your stack

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Your stack

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