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An insufficient entropy vulnerability was found in glibc. The getrandom and arc4random family of functions may return predictable randomness if these functions are called again after the fork, which happens concurrently with a call to any of these functions.

CVE-2025-0577 identifies an insufficient entropy vulnerability in the GNU C Library (glibc), specifically affecting the getrandom and arc4random family of functions. These functions are critical for generating cryptographically secure random numbers used in various security operations, including key generation, session tokens, and nonces. The vulnerability arises when these functions are called concurrently after a fork system call, a common operation in Unix-like systems to create child processes. Due to the fork, the entropy pool or internal state used by these functions may not be properly reinitialized or reseeded, causing the functions to return predictable or repeated random values. This predictability undermines the randomness guarantees essential for cryptographic strength, potentially allowing attackers to guess or reproduce supposedly random values. The affected versions are Fedora-specific builds 2.39-28.fc40 and 2.40-12.fc41 of glibc. The CVSS 3.1 base score is 4.8 (medium), reflecting network attack vector, high attack complexity, no privileges required, no user interaction, and limited confidentiality and integrity impact without availability impact. No known exploits have been reported, but the vulnerability poses a risk to any system relying on these glibc versions for secure random number generation, especially in multi-process environments. The issue is particularly relevant for server and cloud environments where forking and concurrent random number generation are common.

Detailed information about CVE-2025-0577: Insufficient Entropy. Get real-time updates, technical details, and mitigation strategies.

CVE-2025-0577: Insufficient Entropy - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-0577: Insufficient Entropy

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