CVE-2026-21104
Samsung KnoxVault Heap-Based Buffer Overflow
Description
Heap-based buffer overflow in KnoxVault trustlet prior to SMR Sep-2026 Release 1 allows local privileged attackers to execute arbitrary code.
INFO
Published Date :
Sept. 9, 2026, 5:17 a.m.
Last Modified :
Sept. 11, 2026, 4:17 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | 3af57064-a867-422c-b2ad-40307b65c458 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Install the SMR Sep-2026 Release 1 update.
- Verify the trustlet is patched.
- Restart affected services or systems.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-21104.
| URL | Resource |
|---|---|
| https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-21104 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-21104
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-21104 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-21104 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 11, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-21104', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-10T14:16:51.424133Z'} {'id': 'CVE-2026-21104', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-10T00:00:00+00:00'} -
Initial Analysis by [email protected]
Sep. 10, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:o:samsung:android:15.0:-:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-apr-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-mar-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-jun-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-may-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-jul-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:-:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-aug-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-aug-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-sep-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-sep-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-oct-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-oct-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-nov-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-nov-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-dec-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-dec-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-feb-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-jan-2025-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-jan-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-jan-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-feb-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-feb-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-mar-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-mar-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-apr-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-apr-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-may-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-may-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-jul-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-jun-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-jul-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-jun-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:15.0:smr-aug-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:16.0:smr-aug-2026-r1:*:*:*:*:*:* *cpe:2.3:o:samsung:android:17.0:-:*:*:*:*:*:* Added Reference Type Samsung Mobile: https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 10, 2026
Action Type Old Value New Value Added CWE CWE-122 Added SSVC {'id': 'CVE-2026-21104', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-10T14:16:51.424133Z'} -
New CVE Received by [email protected]
Sep. 09, 2026
Action Type Old Value New Value Added Description Heap-based buffer overflow in KnoxVault trustlet prior to SMR Sep-2026 Release 1 allows local privileged attackers to execute arbitrary code. Added CVSS V4.0 AV:L/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/21xxx/CVE-2026-21104.json">CVE-2026-21104</a> Added Reference https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09