CVE-2026-20982: 
NixOS vulnerability analysis and mitigation

CVE-2026-20982 is a path traversal vulnerability in Samsung's ShortcutService component affecting Samsung Android devices running Android 14, 15, and 16 prior to the SMR Feb-2026 Release 1 security update. The flaw allows a privileged local attacker to create files with system-level privileges by exploiting improper pathname restriction (CWE-22). It was published on February 4, 2026, with a patch released as part of Samsung's February 2026 Security Maintenance Release. The vulnerability carries a CVSS v3.1 base score of 6.0 (Medium) and a CVSS v4.0 base score of 6.8 (Medium) (Samsung Security, Red Hat CVE).

The vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory — Path Traversal) and resides in the ShortcutService component of Samsung's Android customization layer. A privileged local attacker can supply a crafted path input to ShortcutService that bypasses directory restrictions, enabling the creation of arbitrary files in locations accessible only to the system user. Exploitation requires the attacker to already hold elevated (privileged) local access on the device, limiting the attack surface but enabling privilege escalation to system-level file write capabilities. Attack patterns associated with this vulnerability include path traversal techniques such as using slashes, URL encoding, and alternate encodings to bypass validation logic (CAPEC-126, CAPEC-64, CAPEC-76) (Samsung Security).

Successful exploitation allows a privileged local attacker to create files with system-level privileges, potentially enabling further privilege escalation, persistence mechanisms, or modification of critical system files. The primary confidentiality impact is high (sensitive data accessible to the system user may be exposed), while integrity and availability impacts are low. The vulnerability does not affect the broader network or adjacent systems directly, but system-level file write access could be leveraged as a stepping stone for deeper device compromise (Samsung Security, Red Hat CVE).

No public exploit code or active in-the-wild exploitation has been confirmed for CVE-2026-20982 as of the available data. The EPSS score is extremely low at 0.000050 (approximately 0.005%), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. A GitHub repository (github.com/Vikramaditya015/samsung-android-lpe) referencing a Samsung Android local privilege escalation was observed in threat intelligence data, though its direct relevance to this specific CVE is unconfirmed (Samsung Security).

1. Prerequisite — Obtain Privileged Local Access: The attacker must already have a privileged local account or application context on the target Samsung Android device (e.g., via a malicious app granted elevated permissions or a prior privilege escalation).
2. Identify Vulnerable ShortcutService: Confirm the device is running Samsung Android 14, 15, or 16 with a security patch level prior to SMR Feb-2026 Release 1, where ShortcutService does not properly sanitize path inputs.
3. Craft Malicious Path Input: Construct a path traversal payload (e.g., using ../ sequences, URL-encoded slashes, or alternate encodings) targeting a directory outside the intended ShortcutService working directory, such as a system-protected file location.
4. Invoke ShortcutService with Traversal Payload: Trigger the vulnerable ShortcutService API or IPC mechanism with the crafted path, causing the service to create a file at the attacker-controlled location with system-level privileges.
5. Leverage System-Level File Write: Use the newly created file (e.g., a malicious binary, configuration override, or persistence artifact) to escalate privileges further, establish persistence, or modify system behavior (Samsung Security).

• File System: Unexpected files created in system-protected directories (e.g., /system/, /data/system/) with timestamps inconsistent with legitimate system updates; files owned by the system UID created outside normal update windows.
• Logs: Android system logs (logcat) showing ShortcutService handling path inputs containing ../ sequences or URL-encoded path separators; unexpected file creation events logged by the system audit framework.
• Process: ShortcutService process (com.android.server.pm.ShortcutService or related) spawning file write operations to directories outside its expected scope; unusual IPC calls to ShortcutService from non-standard callers.

Samsung has addressed this vulnerability in the SMR Feb-2026 Release 1 security update for Android 14, 15, and 16. Users and administrators should apply the February 2026 Samsung security patch immediately by navigating to Settings > Software Update on affected devices. No configuration-based workaround is available; patching is the only remediation. Organizations managing Samsung device fleets should prioritize deployment of this update through their mobile device management (MDM) solution (Samsung Security).

Coverage of CVE-2026-20982 has been limited to standard vulnerability aggregation and tracking sites. Samsung Fans (sammyfans.com) covered the February 2026 update patch bundle shortly after disclosure. No notable independent researcher commentary, vendor statements beyond the official advisory, or significant social media discussion has been identified for this specific CVE (Samsung Security).