How severe is CVE-2026-21068?

CVE-2026-21068 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-21068 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21068?

CVE-2026-21068 primarily affects Samsung Android. In total, 91 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-21068?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-21068 published?

CVE-2026-21068 was published on 2026-08-10 and last updated on 2026-08-19.

CVE-2026-21068

CVE-2026-21068 is a high-severity vulnerability in Samsung Android with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.4
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-121
Affected product: Samsung Android
Published: 2026-08-10
Last modified: 2026-08-19

Description

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

Frequently asked questions

What is 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.
How severe is CVE-2026-21068?: CVE-2026-21068 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-21068 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21068?: CVE-2026-21068 primarily affects Samsung Android. In total, 91 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-21068?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-21068 published?: CVE-2026-21068 was published on 2026-08-10 and last updated on 2026-08-19.

References

https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=08

Affected products (91)

cpe:2.3:o:samsung:android:14.0:-:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-apr-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-apr-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-apr-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-apr-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-apr-2026-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-aug-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-aug-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-aug-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-aug-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-dec-2021-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-dec-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-dec-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-dec-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-dec-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-feb-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-feb-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-feb-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-feb-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-feb-2026-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jan-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jan-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jan-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jan-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jan-2026-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jul-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jul-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jul-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jul-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jul-2026-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jun-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jun-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jun-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jun-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-jun-2026-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-mar-2022-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-mar-2023-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-mar-2024-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-mar-2025-r1:*:*:*:*:*:*
cpe:2.3:o:samsung:android:14.0:smr-mar-2026-r1:*:*:*:*:*:*

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