NVD security advisory
Security advisory for CVE-2026-109411
CVE-2026-109411
Full advisory details, affected packages, severity context, and original source.
Affected technology
CVE-2026-109411Affected product
Advisory overview
An access control bypass flaw was identified 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.