High‑Severity DSP Driver Flaw (CVE‑2021‑25371) in Samsung Mobile Devices
What It Is
A high‑severity vulnerability (CVE‑2021‑25371) has been identified in the digital signal processor (DSP) driver of Samsung‑branded mobile devices. The flaw permits an attacker to load arbitrary ELF libraries into the DSP, potentially enabling execution of malicious code at a privileged level within the device’s hardware stack.
Exploitability
- No public proof‑of‑concept has been released, and there are no confirmed active exploitation campaigns as of this writing.
- The vulnerability is classified as High severity by CISA, indicating a significant impact if leveraged.
- Exploitation would likely require local access or a compromised application that can interact with the DSP subsystem.
Affected Products
- Samsung mobile devices that include the vulnerable DSP driver (specific models not disclosed by the vendor).
Why It Matters for Compliance & Audit Readiness
From a trust‑and‑control assurance perspective, this flaw underscores gaps in vendor‑management controls and mobile device security controls. Organizations that rely on Samsung devices must demonstrate due diligence by maintaining an up‑to‑date inventory, applying vendor patches promptly, and evidencing continuous monitoring of device firmware integrity. Failure to do so can weaken the defensibility of audit evidence related to:
- Control Mapping – ensuring that device‑level security controls align with frameworks such as NIST CSF PR.IP‑1 (baseline protection) and ISO 27001 A.12.1.2 (patch management).
- Evidence of Due Diligence – documented patch‑management processes and logs of firmware verification provide a defensible trail during audits or regulator inquiries.
Recommended Actions
- Inventory & Prioritise – Identify all Samsung mobile devices in scope and prioritize those with outdated firmware.
- Patch Management – Apply Samsung‑issued firmware updates that address the DSP driver flaw as soon as they become available.
- MDM Enforcement – Strengthen Mobile Device Management (MDM) policies to block the installation of unverified applications and to enforce integrity checks on DSP‑related binaries.
- Continuous Monitoring – Deploy endpoint detection tools capable of monitoring DSP activity and flagging anomalous library loads.
- Evidence Capture – Record patch‑deployment logs, MDM policy configurations, and monitoring alerts to build a defensible audit trail.
Source: https://nvd.nist.gov/vuln/detail/CVE-2021-25371