CVE-2018-9386

Local privilege escalation via unchecked reboot command

Published Dec 5, 2024 · Updated Dec 6, 2024

Stack buffer overflow in Google's Android HTC reboot_block driver allows local users with System privileges to gain elevated privileges. The reboot_block_command routine fails to bound the command length before writing it into a stack buffer. Exploitation requires existing System execution privileges, needs no user interaction, and can elevate the caller beyond that access boundary.

CVSS severity6.7
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

Stack buffer overflow in Google's Android HTC reboot_block driver allows local users with System privileges to gain elevated privileges. The reboot_block_command routine fails to bound the command length before writing it into a stack buffer. Exploitation requires existing System execution privileges, needs no user interaction, and can elevate the caller beyond that access boundary.

The record

CVE
CVE-2018-9386
Published
Dec 5, 2024
Updated
Dec 6, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-787, CWE-120, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 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=kernel
  2. Affected versionversion=Kernel

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google Cloud · Androidversion=kernel; version=Kernel

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7CISA-ADPCVSS:3.1/AV:L/AC:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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