CVE-2025-58347: Samsung Exynos 980 Firmware DOS Vulnerability

CVE-2025-58347 Overview

A memory exhaustion vulnerability has been discovered in the Wi-Fi driver used in Samsung Mobile Processor and Wearable Processor Exynos chipsets. The vulnerability exists in the handling of write operations to /proc/driver/unifi0/p2p_certif, where unbounded memory allocation occurs when processing large buffers. This flaw allows an attacker with local access to trigger kernel memory exhaustion, resulting in a denial of service condition.

Critical Impact

An attacker with local access to affected Samsung Exynos-powered devices can exhaust kernel memory through malicious write operations to the Wi-Fi driver's proc filesystem interface, causing system instability or complete denial of service.

Affected Products

• Samsung Exynos 980 (Mobile Processor)
• Samsung Exynos 850 (Mobile Processor)
• Samsung Exynos 1080 (Mobile Processor)
• Samsung Exynos 1280 (Mobile Processor)
• Samsung Exynos 1330 (Mobile Processor)
• Samsung Exynos 1380 (Mobile Processor)
• Samsung Exynos 1480 (Mobile Processor)
• Samsung Exynos 1580 (Mobile Processor)
• Samsung Exynos W920 (Wearable Processor)
• Samsung Exynos W930 (Wearable Processor)
• Samsung Exynos W1000 (Wearable Processor)

Discovery Timeline

• February 3, 2026 - CVE-2025-58347 published to NVD
• February 5, 2026 - Last updated in NVD database

Technical Details for CVE-2025-58347

Vulnerability Analysis

This vulnerability is classified as CWE-770 (Allocation of Resources Without Limits or Throttling). The Wi-Fi driver in affected Samsung Exynos processors fails to properly validate or limit the size of incoming data when processing write operations to the /proc/driver/unifi0/p2p_certif interface. This proc filesystem entry is associated with P2P (Wi-Fi Direct) certification functionality in the Unifi wireless driver.

When a user writes data to this interface, the driver allocates kernel memory to store the buffer without implementing appropriate size checks or allocation limits. An attacker can exploit this by supplying an excessively large buffer, causing the kernel to allocate memory until system resources are exhausted.

The attack requires local access to the device, which limits the exploitation surface to scenarios where an attacker has already gained some level of access to the system, such as through a malicious application or physical access.

Root Cause

The root cause of this vulnerability lies in the improper input validation within the Wi-Fi driver's proc filesystem handler. The driver accepts write operations to /proc/driver/unifi0/p2p_certif without enforcing maximum buffer size limits. This allows arbitrarily large memory allocations in kernel space, which can rapidly deplete available system memory.

The lack of resource throttling or sanity checks on input size before memory allocation is a common programming oversight that can lead to denial of service conditions, particularly in kernel-mode drivers where memory management is critical.

Attack Vector

The attack vector for this vulnerability is local, meaning an attacker needs direct access to the affected device. The exploitation path involves:

1. An attacker gains local access to a device powered by an affected Samsung Exynos processor
2. The attacker writes a large buffer to /proc/driver/unifi0/p2p_certif
3. The Wi-Fi driver attempts to allocate kernel memory for the entire buffer without size validation
4. Repeated or sufficiently large write operations exhaust available kernel memory
5. System becomes unstable or unresponsive due to memory exhaustion

The vulnerability does not require any user interaction or elevated privileges to exploit, making it accessible to any process with write permissions to the affected proc filesystem entry.

Detection Methods for CVE-2025-58347

Indicators of Compromise

• Unusual write operations or access patterns to /proc/driver/unifi0/p2p_certif
• Sudden kernel memory exhaustion without legitimate memory-intensive processes running
• System instability, crashes, or unresponsiveness on Exynos-powered devices
• Out-of-memory (OOM) killer events in kernel logs targeting system processes

Detection Strategies

• Monitor file system access to /proc/driver/unifi0/ directory for anomalous write operations
• Implement kernel memory usage monitoring to detect rapid memory allocation spikes
• Deploy endpoint detection solutions capable of monitoring proc filesystem interactions
• Review application permissions to identify unauthorized access to wireless driver interfaces

Monitoring Recommendations

• Enable kernel auditing to log access to sensitive proc filesystem entries
• Configure alerts for abnormal memory allocation patterns in kernel space
• Monitor for OOM conditions and correlate with Wi-Fi driver activity
• Implement resource usage baselines for Exynos-powered devices to identify deviations

How to Mitigate CVE-2025-58347

Immediate Actions Required

• Apply firmware updates from Samsung as soon as they become available
• Restrict access to /proc/driver/unifi0/ directory to essential system processes only
• Review and minimize installed applications on affected devices to reduce local attack surface
• Monitor device behavior for signs of exploitation attempts

Patch Information

Samsung has published a security advisory for this vulnerability. Device manufacturers and users should check the Samsung Product Security Updates page for firmware updates addressing CVE-2025-58347. The specific advisory can be found at the Samsung CVE-2025-58347 Advisory page.

Firmware updates should be applied through the device manufacturer's official update mechanism, as Samsung provides the processor firmware that is then integrated into end-user devices by OEMs.

Workarounds

• Limit application installations to trusted sources to reduce risk of malicious local access
• If possible, restrict file system permissions on the vulnerable proc entry
• Consider disabling Wi-Fi Direct/P2P functionality if not required for device operation
• Implement application sandboxing where available to limit proc filesystem access