What is CVE-2026-21068?

CVE-2026-21068 is a high-severity vulnerability in Samsung Android, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-08-10.

How severe is CVE-2026-21068?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Samsung Android

CVE-2026-21068

Stack-based buffer overflow in libril_sem.so prior to SMR Aug-2026 Release 1 allows privileged local attackers to execute arbitrary code.

Vulnerability class: Buffer Overflow

Published 2026-08-10 · last modified 2026-08-19.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (2.6th percentile), scored 2026-09-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.6% 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
Samsung Mobile Devices — versions SMR Aug-2026 Release in Android 14, 15, 16

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-21068?: CVE-2026-21068 is a high-severity vulnerability in Samsung Android, classified under Stack-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-08-10.
How severe is CVE-2026-21068?: High severity. CVSS v3 base score is 7.8 out of 10.