CVE-2018-9431

Local privilege escalation via mismatched parcel decoding

Published Dec 2, 2024 · Updated Dec 3, 2024

Local privilege escalation in Google Android 8.0 and 8.1 allows local users to gain higher privileges via malformed OSUInfo parcel data. OSUInfo.java writes and reads its Parcelable fields in different sequences, so untrusted parcel data is decoded into unintended fields without validation. A low-privileged local process can trigger the mismatch without user interaction, compromising confidentiality, integrity, and availability.

CVSS severity7.8
High
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

Local privilege escalation in Google Android 8.0 and 8.1 allows local users to gain higher privileges via malformed OSUInfo parcel data. OSUInfo.java writes and reads its Parcelable fields in different sequences, so untrusted parcel data is decoded into unintended fields without validation. A low-privileged local process can trigger the mismatch without user interaction, compromising confidentiality, integrity, and availability.

The record

CVE
CVE-2018-9431
Published
Dec 2, 2024
Updated
Dec 3, 2024
Vendor
Google
Product
Android
Classifications
CWE-276, T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 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=8
  2. Affected versionversion=8.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · Androidversion=8; version=8.1

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS: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-276Incorrect Default Permissions
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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