CVE-2021-25411Public exploit

Root-privileged kernel write via read-only address translation

Published Jun 11, 2021 · Updated Aug 3, 2024

Improper address validation in Samsung Mobile Devices RKP before SMR JUN-2021 Release 1 allows root-privileged local users to write kernel memory. The virt_to_phys_el1 helper returns a physical address after a read translation succeeds, and RKP command handlers then write through that address without requiring write permission. Root-level kernel access and RKP hypercall access are prerequisites; successful use bypasses read-only kernel-memory protections.

CVSS severity4.4
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper address validation in Samsung Mobile Devices RKP before SMR JUN-2021 Release 1 allows root-privileged local users to write kernel memory. The virt_to_phys_el1 helper returns a physical address after a read translation succeeds, and RKP command handlers then write through that address without requiring write permission. Root-level kernel access and RKP hypercall access are prerequisites; successful use bypasses read-only kernel-memory protections.

The record

CVE
CVE-2021-25411
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-94, CWE-20, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 11, 2021CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Q(10.0), R(11.0) devices with Exynos9610, 9810, 9820, 9830 <SMR JUN-2021 Release 1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile Devicesversion=Q(10.0), R(11.0) devices with Exynos9610, 9810, 9820, 9830 <SMR JUN-2021 Release 1

Published CVSS scores

4.4NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:P/A:N

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 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 exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo