CVE-2026-21116 Samsung Mobile CVE debrief

Who should care

Defenders responsible for Samsung Mobile Devices, particularly those handling local security and vulnerability management, should assess exposure and apply patches.

Why it matters

CVE-2026-21116 is a medium-severity vulnerability in Samsung Mobile Devices, allowing local attackers to write out-of-bounds memory. Defenders should prioritize verifying exposure and applying patches.

• Verify exposure of Samsung Mobile Devices to local attack vectors
• Apply patches to prevent out-of-bounds write vulnerabilities
• Monitor and track local security threats

Technical summary

The vulnerability is caused by an out-of-bounds write in libsmkvextractor.so prior to SMR Oct-2026 Release 1, allowing local attackers to write out-of-bounds memory. This issue affects Samsung Mobile Devices and can be exploited through local attack vectors. To mitigate this vulnerability, defenders should prioritize verifying exposure and applying patches for SMR Oct-2026 Release 1 or later. Additionally, monitoring local attack vectors and out-of-bounds write vulnerabilities is crucial to prevent potential security breaches.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Samsung Mobile Devices, focusing on local attack vectors and out-of-bounds write vulnerabilities.

Recommended defensive actions

• Verify exposure of Samsung Mobile Devices to CVE-2026-21116
• Apply patches for SMR Oct-2026 Release 1 or later
• Monitor local attack vectors and out-of-bounds write vulnerabilities

Evidence notes

The CVE record and source item provide limited information on affected versions and exploitation. Further verification is required from official sources, such as Samsung Mobile's security updates.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.