A flaw was found in cifs-utils. This flaw allows an unprivileged local user to achieve privilege escalation. When a privileged service mounts a Common Internet File System (CIFS) share using a user-controlled credentials file, input values are not properly sanitized before being assembled into mount options. A local attacker can exploit this vulnerability to inject unauthorized mount options, allowing them to bypass permission checks and execute files with administrative (root) privileges.
Casky was already ahead
This CVE exploits attack patterns that Casky's 0matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-104715 represents a critical privilege escalation vulnerability in cifs-utils where unsanitized user input in credentials files can be injected into mount options. When a privileged service mounts CIFS shares using attacker-controlled credential files, insufficient input validation allows local users to inject arbitrary mount parameters that bypass permission restrictions. This affects any system running vulnerable cifs-utils versions where unprivileged users can influence mount credential files—a common scenario in multi-user environments, containerized deployments, and shared hosting platforms. The vulnerability is particularly dangerous because it transforms a local user's limited permissions into root-level access by manipulating how the filesystem enforces access controls.
While MITRE ATT&CK techniques aren't formally mapped to this CVE, Casky's security skills can detect attack patterns associated with Privilege Escalation (T1134) and Abuse of Elevation Control Mechanism (T1548) by analyzing suspicious mount command construction and credential file manipulation. Practitioners using Casky would identify findings centered on: (1) detection of mount commands with unusual or injected parameters originating from unprivileged processes, (2) monitoring of credential file access patterns where local users modify files used by privileged mount operations, and (3) behavioral analysis showing permission-denied errors followed by successful root-level file execution. The platform's Claude-powered reasoning capability helps correlate file modification timestamps, process ownership chains, and mount option anomalies to surface the injection attack pattern before privilege escalation succeeds.
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