CVE-2025-48751: Tickbh Process Lock Race Vulnerability

CVE-2025-48751 Overview

CVE-2025-48751 is a race condition vulnerability discovered in the process_lock crate version 0.1.0 for Rust. The vulnerability exists in the unlock function, where improper synchronization allows for data races that could lead to memory corruption, unauthorized data access, or denial of service conditions.

Critical Impact

This race condition vulnerability in a Rust synchronization primitive could undermine the memory safety guarantees that Rust provides, potentially allowing attackers to corrupt shared state, cause crashes, or achieve arbitrary code execution in affected applications.

Affected Products

• tickbh process_lock version 0.1.0
• Applications using the process_lock crate for inter-process synchronization
• Rust projects depending on tickbh:process_lock

Discovery Timeline

• 2025-05-24 - CVE-2025-48751 published to NVD
• 2026-01-30 - Last updated in NVD database

Technical Details for CVE-2025-48751

Vulnerability Analysis

The process_lock crate provides inter-process locking mechanisms for Rust applications. The vulnerability resides in the unlock function implementation, which fails to properly synchronize access to shared state during lock release operations. This creates a Time-of-Check Time-of-Use (TOCTOU) window where multiple threads or processes can simultaneously access and modify the lock state, leading to data races.

In Rust, data races are considered undefined behavior and can lead to severe consequences including memory corruption, information disclosure, and potential code execution. While Rust's ownership model typically prevents such issues at compile time, unsafe code blocks or improper use of synchronization primitives can introduce these vulnerabilities.

The race condition is classified under CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization), indicating that the vulnerability stems from inadequate protection of shared resources during concurrent access.

Root Cause

The root cause is improper synchronization in the unlock function of the process_lock crate. The implementation fails to use appropriate atomic operations or memory barriers when releasing locks, creating a window where concurrent unlock operations can interfere with each other. This violates Rust's safety guarantees and introduces undefined behavior through data races on shared lock state.

Attack Vector

The vulnerability can be exploited through network-accessible applications that utilize the affected process_lock crate for concurrent resource management. An attacker could trigger race conditions by initiating multiple concurrent operations that cause the vulnerable unlock function to be called simultaneously from different execution contexts.

The attack does not require authentication or user interaction, making it particularly dangerous for services exposed to untrusted network traffic. Successful exploitation could result in:

• Confidentiality Impact: Unauthorized read access to memory regions protected by the lock
• Integrity Impact: Corruption of shared data structures due to unsynchronized modifications
• Availability Impact: Application crashes or deadlocks resulting from corrupted lock state

For technical details on the vulnerability mechanism, refer to the GitHub ProcessLock Issue Discussion.

Detection Methods for CVE-2025-48751

Indicators of Compromise

• Unexpected application crashes with stack traces pointing to lock-related operations
• Memory corruption errors or segmentation faults in applications using process_lock
• Inconsistent application state or data corruption in shared resources
• Anomalous behavior in concurrent operations that utilize process locking

Detection Strategies

• Audit your Rust project dependencies using cargo audit to identify vulnerable versions of process_lock
• Review Cargo.lock files for process_lock version 0.1.0 dependencies
• Implement runtime monitoring for applications using the affected crate to detect race condition symptoms
• Use thread sanitizers (TSAN) during development and testing to identify data race conditions

Monitoring Recommendations

• Monitor application logs for crash patterns associated with lock operations
• Implement alerting for unexpected process terminations in production environments
• Track memory usage anomalies that could indicate corruption from race conditions
• Enable debug logging for concurrent operations to identify race condition triggers

How to Mitigate CVE-2025-48751

Immediate Actions Required

• Audit all Rust projects for dependencies on process_lock version 0.1.0
• Replace the vulnerable crate with alternative locking mechanisms from the Rust standard library or vetted alternatives
• Review application code for patterns that could trigger the race condition
• Consider implementing additional synchronization layers as a temporary mitigation

Patch Information

As of the last update, users should check the Crates.io Process Lock Description for updated versions that address this vulnerability. If no patched version is available, migration to alternative locking primitives is recommended.

Alternative approaches include:

• Using Rust's standard library synchronization primitives (std::sync::Mutex, std::sync::RwLock)
• Adopting well-maintained crates such as parking_lot for high-performance locking
• Implementing file-based locking using fs2 crate for inter-process synchronization

Workarounds

• Replace process_lock with standard library alternatives like std::sync::Mutex for in-process locking
• For inter-process locking requirements, use file-based locking mechanisms with proper atomicity guarantees
• Implement additional application-level synchronization to protect critical sections
• Avoid concurrent unlock operations by restructuring application logic where feasible

# Check for vulnerable dependency in Rust projects
cargo tree -i process_lock

# Run cargo audit to identify security vulnerabilities
cargo install cargo-audit
cargo audit

# Remove vulnerable dependency and update Cargo.toml
# Replace process_lock with alternative locking mechanism