CVE-2021-39252: 
Alma Linux vulnerability analysis and mitigation

CVE-2021-39252 is a security vulnerability discovered in NTFS-3G versions prior to 2021.8.22. The vulnerability involves an out-of-bounds read in the ntfsielookup function when processing a crafted NTFS image (NTFS3G Advisory, CVE Mitre).

The vulnerability is characterized by an out-of-bounds read condition that occurs in the ntfsielookup function when processing specially crafted NTFS images. The issue affects NTFS-3G, which is a read-write NTFS driver for FUSE. The vulnerability has been assigned a CVSS v3.1 score of 7.8 (High), with attack vector being Local, attack complexity Low, and requiring Low privileges (Ubuntu Security).

The vulnerability could potentially allow an attacker with local access to execute arbitrary privileged code if the ntfs-3g binary is setuid root, or if the attacker has physical access to an external port on a computer configured to run the ntfs-3g binary when external storage is connected (NTFS3G Advisory).

The vulnerability has been fixed in NTFS-3G version 2021.8.22. Users are strongly recommended to upgrade to this version or later. Various Linux distributions have released security updates to address this vulnerability, including Debian (DSA-4971-1), Ubuntu, and Fedora (Debian Security, Fedora Update).