Race conditions
Another operation changes shared state between a check and the action that relies on it.
CWE-362 · NVD record: nvd@nist.gov
Video course · Free course. C programming and memory concepts are useful; covers several weakness types.
Exploited. On CISA's list since 2023-06-29.
Samsung Mobile Devices Race Condition Vulnerability
CVE-2021-25394 · Samsung Mobile Devices · Published 2021-06-11
How bad would it be?
6.4 out of 10
CVSS rates it medium.
How likely is it to be used?
0.4%
Estimated chance of exploitation in the next 30 days, higher than 34% of all scored flaws (EPSS, 2026-10-29).
Is it already being used?
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1198 days ago (2023-07-20).
What CISA says to do
Apply updates per vendor instructions or discontinue use of the product if updates are unavailable
Samsung mobile devices contain a race condition vulnerability within the MFC charger driver that leads to a use-after-free allowing for a write given a radio privilege is compromised.
What the flaw is
A use after free vulnerability via race condition in MFC charger driver prior to SMR MAY-2021 Release 1 allows arbitrary write given a radio privilege is compromised.
From the NVD.
Fixes and advisories
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Understand the kind of weakness behind this flaw. These resources teach the weakness, rather than reproduce this specific CVE. Follow the vendor's advice above to fix the affected product.
Use-after-free
A program uses memory after releasing it, when its contents may belong to something else.
CWE-416 · CISA KEV; NVD record: mobile.security@samsung.com; NVD record: nvd@nist.gov
Practice labs · Free account. Requires C, pointers and basic binary exploitation; begin with Freebie (Easy).
CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.
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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.