# CVE-2025-52555: CephFS Permission Escalation Vulnerability in Ceph Fuse mounted FS

CVE-2025-52555 is fixed in ceph on 1 platform, first by DEBIAN-CVE-2025-52555, released June 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-52555
- Priority: Routine
- CVSS: 6.5 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 26, 2025
- Weakness: Improper Privilege Management
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-52555

## Description

Ceph is a distributed object, block, and file storage platform. In versions 17.2.7, 18.2.1 through 18.2.4, and 19.0.0 through 19.2.2, an unprivileged user can escalate to root privileges in a ceph-fuse mounted CephFS by chmod 777 a directory owned by root to gain access. The result of this is that a user could read, write and execute to any directory owned by root as long as they chmod 777 it. This impacts confidentiality, integrity, and availability. It is patched in versions 17.2.8, 18.2.5, and 19.2.3.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ceph Debian 12.15 (bookworm) | 16.2.15+ds-0+deb12u2 | [DEBIAN-CVE-2025-52555](https://patchblox.com/security/data/fix/linux/debian-cve-2025-52555.md) | Jun 26, 2025 |
| Linux | ceph Debian 13.5 (trixie) | 18.2.6-1 | [DEBIAN-CVE-2025-52555](https://patchblox.com/security/data/fix/linux/debian-cve-2025-52555.md) | Jun 26, 2025 |
| Linux | ceph Debian 14 | 18.2.6-1 | [DEBIAN-CVE-2025-52555](https://patchblox.com/security/data/fix/linux/debian-cve-2025-52555.md) | Jun 26, 2025 |
| Linux | ceph RHEL 10 | 20.1.0-144.el10cp | [RHSA-2026:1536](https://patchblox.com/security/data/fix/linux/rhsa-2026-1536.md) | Jan 20, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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