CVE-2022-20567

Local privilege escalation via PPPoL2TP socket race

Published Dec 16, 2022 · Updated Apr 21, 2025

Use-after-free in Linux Kernel PPPoL2TP code on Android allows local users to gain elevated execution through a teardown race. In l2tp_ppp.c, pppol2tp_release schedules an RCU callback to drop the socket's final reference while the session can be destroyed without holding its own socket reference. Exploitation requires local execution and winning the race; success elevates execution, while a failed trigger can corrupt kernel state.

CVSS severity7.4
High
EPSS probability0.11%
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 Linux Kernel PPPoL2TP code on Android allows local users to gain elevated execution through a teardown race. In l2tp_ppp.c, pppol2tp_release schedules an RCU callback to drop the socket's final reference while the session can be destroyed without holding its own socket reference. Exploitation requires local execution and winning the race; success elevates execution, while a failed trigger can corrupt kernel state.

The record

CVE
CVE-2022-20567
Published
Dec 16, 2022
Updated
Apr 21, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, 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 kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=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
7.4CISA-ADPCVSS:3.1/AV:L/AC:H/PR:N/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')
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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