CVE-2026-109411
An access control bypass flaw was found in Samba's vfs_ceph_rgw module in it's openat() function. An authenticated user can bypass access controls to read or overwrite restricted files on shares configured with the experimental vfs_ceph_rgw module. When a client requests an existing file using mismatched character casing, the module fails to perform a case-insensitive lookup correctly, causing the server to treat the operation as creating a new file. As a result, the server skips standard permission checks on the existing file, allowing the attacker to access or overwrite sensitive data owned by other users.
- Score
- CVSS 3.1 8.1 High
- Status
- Awaiting Analysis - secalert@redhat.com
- Published
- 2026-10-28
- Last modified
- 2026-10-28
- Weaknesses
- CWE-178
Affected products
References
- https://access.redhat.com/security/cve/CVE-2026-109411
- https://attachments.samba.org/attachment.cgi?id=19294
- https://attachments.samba.org/attachment.cgi?id=19295
- https://bugzilla.redhat.com/show_bug.cgi?id=2552136
- https://bugzilla.samba.org/show_bug.cgi?id=16276
