CVE-2025-68778

CVE-2025-68778 is a vulnerability in the Linux kernel's Btrfs filesystem that can lead to a mount failure after a power loss during specific directory and file operations. This occurs because the log replay mechanism can incorrectly assign multiple hard links to a directory, which Btrfs does not permit. The vulnerability affects the integrity of the Btrfs filesystem, potentially causing data unavailability. The severity is moderate, with a FAUCET Risk Score of 39/100. The attack vector involves a specific sequence of filesystem operations followed by an unexpected power failure, making direct exploitation difficult. The impact is primarily denial of service due to filesystem corruption and unmountability. There is no evidence of active exploitation, and no exploit code is publicly available on platforms like Metasploit or ExploitDB. However, the vulnerability has garnered significant community attention with 11 mentions in discussions and one media article, indicating awareness and concern within the cybersecurity community.