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CVE-2026-21111: CWE-787: Out-of-bounds Write in Samsung Mobile libsthmbc

0
Medium
VulnerabilityCVE-2026-21111cvecve-2026-21111cwe-787
Published: 09/09/2026 (09/09/2026, 04:48:01 UTC)
Source: CVE Database V5
Vendor/Project: Samsung Mobile
Product: libsthmbc

Description

CVE-2026-21111 is an out-of-bounds write vulnerability in the Samsung Mobile component libsthmbc.so affecting versions prior to One UI 8.5. This flaw allows local attackers with limited privileges to write outside the intended memory bounds, potentially leading to memory corruption. The vulnerability has a medium severity rating with a CVSS 4.0 score of 6.9. No official patch or remediation guidance has been provided yet, and there are no known exploits in the wild.

CVSS v4.0

Score 6.9medium

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Vuln. Confidentiality
High
Vuln. Integrity
Low
Vuln. Availability
Low
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/09/2026, 11:08:17 UTC

Technical Analysis

This vulnerability involves an out-of-bounds write in the Samsung Mobile library libsthmbc.so before One UI 8.5. It permits local attackers with limited privileges to write to memory outside the allocated buffer, which could cause memory corruption. The CVSS 4.0 vector indicates low attack complexity and no user interaction required, but the attacker must have local privileges. The vulnerability is classified under CWE-787 (Out-of-bounds Write). No patch or official remediation level has been disclosed by the vendor as of the publication date.

Potential Impact

Successful exploitation could allow a local attacker to corrupt memory, potentially leading to application crashes or escalation of privileges. However, exploitation requires local access with limited privileges, and no remote or network attack vector is indicated. The vulnerability does not require user interaction and has high impact on confidentiality and low impact on integrity and availability according to the CVSS vector.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, limit local access to trusted users only. Monitor for vendor updates regarding patches or mitigations for libsthmbc in One UI.

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Technical Details

Data Version
5.2
Assigner Short Name
SamsungMobile
Date Reserved
2025-12-11T01:33:35.830Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6aa13d67acd9273b493465c0

Added to database: 09/09/2026, 11:05:11 UTC

Last enriched: 09/09/2026, 11:08:17 UTC

Last updated: 09/09/2026, 22:52:09 UTC

Views: 10

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