What is CVE-2026-21085?

CVE-2026-21085 is a medium-severity vulnerability in Samsung Android, classified under Out-of-bounds Write. CVSS score: 6.7/10. Published 2026-09-09.

How severe is CVE-2026-21085?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Buffer overflow in Samsung Android

CVE-2026-21085

Out-of-bounds write in Keymaster trustlet prior to SMR Sep-2026 Release 1 allows local privileged attackers to write out-of-bounds memory.

Vulnerability class: Buffer Overflow

Published 2026-09-09 · last modified 2026-09-11.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.3th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Samsung Android — versions 14.0, 15.0, 16.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2026-21085?: CVE-2026-21085 is a medium-severity vulnerability in Samsung Android, classified under Out-of-bounds Write. CVSS score: 6.7/10. Published 2026-09-09.
How severe is CVE-2026-21085?: Medium severity. CVSS v3 base score is 6.7 out of 10.