CVE-2021-0707

Local privilege escalation via DMA-BUF release race

Published Apr 12, 2022 · Updated Aug 3, 2024

Use-after-free in Android kernel DMA-BUF code allows local users to escalate privileges by racing buffer closure with debug-info reads. dma_buf_release removes a buffer from db_list only after __fput frees file->f_inode, allowing dma_buf_debug_show to read the freed inode during the gap. Exploitation requires local low-privileged execution and control of the close/read race, but no user interaction or additional privileges.

CVSS severity7.8
High
EPSS probability0.16%
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 DMA-BUF code allows local users to escalate privileges by racing buffer closure with debug-info reads. dma_buf_release removes a buffer from db_list only after __fput frees file->f_inode, allowing dma_buf_debug_show to read the freed inode during the gap. Exploitation requires local low-privileged execution and control of the close/read race, but no user interaction or additional privileges.

The record

CVE
CVE-2021-0707
Published
Apr 12, 2022
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 12, 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?

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  1. Affected versionversion=Android kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=Android kernel

Published CVSS scores

7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8NIST NVDCVSS: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.

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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
Privilegesauthenticated
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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