Arbitrary write via charger-driver race
Published Jun 11, 2021 · Updated Oct 21, 2025
Use-after-free in Samsung Mobile Devices before SMR MAY-2021 Release 1 allows local users to write arbitrary memory through a race. The MFC charger driver lacks synchronization points, allowing concurrent operations to access freed memory and bypass the signature check. Exploitation requires compromised radio privilege on selected Exynos or Qualcomm devices and can corrupt memory with attacker-controlled writes.
Summary
What happened
Use-after-free in Samsung Mobile Devices before SMR MAY-2021 Release 1 allows local users to write arbitrary memory through a race. The MFC charger driver lacks synchronization points, allowing concurrent operations to access freed memory and bypass the signature check. Exploitation requires compromised radio privilege on selected Exynos or Qualcomm devices and can corrupt memory with attacker-controlled writes.
The record
- CVE
- CVE-2021-25395
- Published
- Jun 11, 2021
- Updated
- Oct 21, 2025
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Samsung Mobile Devices
- Classifications
- CWE-362, CAPEC-29, CAPEC-26, T1404
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 11, 2021CVE publishedPublication date reported by the CVE source.
- Jun 29, 2023Exploitation reportedCISA Known Exploited Vulnerabilities Catalog listing
- Oct 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=O(8.x), P(9.0), Q(10.0), R(11.0) <SMR MAY-2021 Release 1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog listingknown exploited catalog
Technologies
Your stack
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Your stack
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