CVE-2025-52555: 
Linux Debian vulnerability analysis and mitigation

CVE-2025-52555 is a security vulnerability discovered in Ceph, a distributed object, block, and file storage platform. The vulnerability was disclosed on June 26, 2025, affecting versions 17.2.7, 18.2.1 through 18.2.4, and 19.0.0 through 19.2.2. This vulnerability allows an unprivileged user to escalate to root privileges in a ceph-fuse mounted CephFS system (GitHub Advisory, NVD).

The vulnerability is classified as CWE-269 (Improper Privilege Management) with a CVSS v3.1 score of 6.5 (Medium). The attack vector is Adjacent (AV:A), with High attack complexity (AC:H), requiring Low privileges (PR:L), No user interaction (UI:N), Changed scope (S:C), High confidentiality impact (C:H), Low integrity impact (I:L), and No availability impact (A:N) (GitHub Advisory, Wiz).

The vulnerability enables unprivileged users to gain unauthorized access to root-owned directories by using the chmod 777 command. This impacts both confidentiality and integrity of the system, as attackers can read, write, and execute any directory owned by root after changing its permissions (GitHub Advisory, Wiz).

The vulnerability has been patched in Ceph versions 17.2.8, 18.2.5, and 19.2.3. Users are strongly advised to upgrade to these patched versions to prevent potential exploitation (GitHub Advisory, GitHub PR).

Security researchers have identified additional concerns regarding the initial fix, particularly about the handling of SUID and SGID bits. This led to further discussion in the security community about proper permission management in filesystem implementations (OSS Security).