Description
Time-of-check time-of-use race condition in fabricKeymaster trustlet prior to SMR Jul-2026 Release 1 allows local privileged attackers to execute arbitrary code.
Published: 2026-07-10
Score: 8.4 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A time‑of‑check fabricKeymaster trustlet, enabling a local attacker who already has privileged access on the device to manipulate the execution sequence and inject arbitrary code. This flaw elevates the attacker’s privileges to that of the trustlet, compromising the confidentiality, integrity, and availability of the device.

Affected Systems

Samsung Mobile Devices that are operating on firmware released prior to the SMR Jul‑2026 Release 1 update are affected. The vulnerability resides exclusively in the FabricKeymaster trustlet bundled with those firmware versions; no separate sub‑product or additional version information is provided.

Risk and Exploitability

The CVSS score of 8.4 denotes high severity, while the EPSS of less than 1% indicates that exploitation is unlikely but not impossible. The vulnerability is not listed in CISA KEV and is purely local, requiring privileged execution; the risk remains significant only for devices that have not applied the latest firmware update.

Generated by OpenCVE AI on July 26, 2026 at 14:03 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Install the SMR Jul‑2026 Release 1 firmware update to patch the FabricKeymaster trustlet.
  • If a firmware upgrade cannot be performed immediately, disable or restrict the Fabric trustlet for local processes that may gain privileged status to mitigate the race condition.
  • Perform an asset inventory to identify all Samsung Mobile Devices still running the affected firmware and prioritize their upgrade.
  • Enforce least privilege for local processes on the device, limiting untrusted applications from acquiring privileged status to reduce the attack surface.

Generated by OpenCVE AI on July 26, 2026 at 14:03 UTC.

Tracking

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Advisories

No advisories yet.

History

Sun, 26 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Title FabricKeymaster Trustlet Race Condition Enabling Local Privilege Escalation
Weaknesses CWE-824

Thu, 23 Jul 2026 08:45:00 +0000

Type Values Removed Values Added
Title FabricKeymaster Trustlet Time‑of‑Check Time‑of‑Use Race Enables Local Privilege Escalation on Samsung Mobile Devices
Weaknesses CWE-362

Sat, 18 Jul 2026 04:45:00 +0000

Type Values Removed Values Added
Title FabricKeymaster Trustlet Time‑of‑Check Time‑of‑Use Race Enables Local Privilege Escalation on Samsung Mobile Devices
Weaknesses CWE-362

Thu, 16 Jul 2026 19:00:00 +0000

Type Values Removed Values Added
Title FabricKeymaster Trustlet Local Privilege Escalation via Time‑of‑Check Time‑of‑Use Race Condition
Weaknesses CWE-617
CWE-732

Tue, 14 Jul 2026 15:15:00 +0000

Type Values Removed Values Added
Title FabricKeymaster Trustlet Local Privilege Escalation via Time‑of‑Check Time‑of‑Use Race Condition
Weaknesses CWE-617
CWE-732

Mon, 13 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
Title Local Privilege Escalation via Time-of-Check Time-of-Use Race in FabricKeymaster Trustlet
Weaknesses CWE-250
CWE-409

Mon, 13 Jul 2026 00:30:00 +0000

Type Values Removed Values Added
Title Local Privilege Escalation via Time-of-Check Time-of-Use Race in FabricKeymaster Trustlet
Weaknesses CWE-250
CWE-409

Sun, 12 Jul 2026 05:45:00 +0000

Type Values Removed Values Added
Title Time‑of‑Check Time‑of‑Use Race in Samsung FabricKeymaster Trustlet Enables Code Execution
Weaknesses CWE-250
CWE-409

Fri, 10 Jul 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Fri, 10 Jul 2026 12:45:00 +0000

Type Values Removed Values Added
Title Time‑of‑Check Time‑of‑Use Race in Samsung FabricKeymaster Trustlet Enables Code Execution
Weaknesses CWE-250
CWE-409

Fri, 10 Jul 2026 08:00:00 +0000

Type Values Removed Values Added
First Time appeared Samsung Mobile
Samsung Mobile samsung Mobile Devices
Vendors & Products Samsung Mobile
Samsung Mobile samsung Mobile Devices

Fri, 10 Jul 2026 05:15:00 +0000

Type Values Removed Values Added
Description Time-of-check time-of-use race condition in fabricKeymaster trustlet prior to SMR Jul-2026 Release 1 allows local privileged attackers to execute arbitrary code.
References
Metrics cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Samsung Mobile Samsung Mobile Devices
cve-icon MITRE

Status: PUBLISHED

Assigner: SamsungMobile

Published:

Updated: 2026-07-11T03:55:19.537Z

Reserved: 2025-12-11T01:33:35.816Z

Link: CVE-2026-21046

cve-icon Vulnrichment

Updated: 2026-07-10T12:22:34.481Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-26T14:15:18Z

Weaknesses
  • CWE-824

    Access of Uninitialized Pointer