CVE-2022-20371

Local privilege escalation via dm-bow range race

Published Aug 11, 2022 · Updated Aug 3, 2024

Use-after-free in Android kernel dm-bow allows local users with System execution privileges to gain elevated privileges without user interaction. dm_bow_dtr and related functions remove ranges fetched from the dm-bow red-black tree without consistently protecting them from concurrent access, allowing a range to be freed while still in use. The race requires local access and existing System execution privileges; successful exploitation elevates privileges without user interaction.

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

Use-after-free in Android kernel dm-bow allows local users with System execution privileges to gain elevated privileges without user interaction. dm_bow_dtr and related functions remove ranges fetched from the dm-bow red-black tree without consistently protecting them from concurrent access, allowing a range to be freed while still in use. The race requires local access and existing System execution privileges; successful exploitation elevates privileges without user interaction.

The record

CVE
CVE-2022-20371
Published
Aug 11, 2022
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-667, 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 kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google Cloud · Androidversion=Android kernel

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-667Improper Locking
T1404Exploitation 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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