CVE-2022-20256

Local privilege escalation via Audio HAL race

Published Aug 11, 2022 · Updated Aug 3, 2024

An out-of-bounds write in the Audio HAL in Google Cloud Android 13 allows local users with System execution privileges to escalate privileges. A race condition lets concurrent Audio HAL operations access shared state without proper synchronization, causing a write beyond the intended buffer boundary. Exploitation requires existing System execution privileges but no user interaction, and successful corruption grants higher local privileges.

CVSS severity6.4
Medium
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in the Audio HAL in Google Cloud Android 13 allows local users with System execution privileges to escalate privileges. A race condition lets concurrent Audio HAL operations access shared state without proper synchronization, causing a write beyond the intended buffer boundary. Exploitation requires existing System execution privileges but no user interaction, and successful corruption grants higher local privileges.

The record

CVE
CVE-2022-20256
Published
Aug 11, 2022
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-362, T1404
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Android-13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google Cloud · Androidversion=Android-13

Published CVSS scores

6.4NIST NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1404Exploitation 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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