CVE-2026-104715 Red Hat CVE debrief

Who should care

System administrators, security teams, and Linux distribution maintainers should assess exposure and prioritize patching or mitigation efforts. They need to verify the presence of vulnerable cifs-utils installations, review system configurations, and ensure that appropriate security measures are in place to prevent exploitation. Additionally, security teams should monitor for potential exploitation attempts and review system logs for suspicious activity.

Why it matters

CVE-2026-104715 allows unprivileged local users to escalate privileges in cifs-utils, posing a risk to system administrators and security teams who need to verify and patch vulnerable installations.

• Verify and patch vulnerable cifs-utils installations to prevent privilege escalation
• Restrict access to CIFS shares to limit the attack surface
• Monitor for suspicious activity to detect potential exploitation attempts

Technical summary

The vulnerability exists in cifs-utils, where an unprivileged local user can achieve privilege escalation by exploiting improper sanitization of input values in mount options when a privileged service mounts a CIFS share using a user-controlled credentials file. This allows local attackers to inject unauthorized mount options and bypass permission checks to execute files with administrative (root) privileges. The issue arises from inadequate validation of user-supplied credentials, enabling attackers to manipulate mount options.

Defensive priority

Defenders should prioritize verifying and patching vulnerable cifs-utils installations, especially in environments where unprivileged local users may pose a risk.

Recommended defensive actions

• Verify and apply patches for cifs-utils
• Restrict access to CIFS shares
• Monitor for suspicious activity
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions, exploitation, and remediation may be necessary for comprehensive risk assessment. Affected versions of cifs-utils need verification, and defenders should check for any unofficial patches or mitigations. The vulnerability's impact on various Linux distributions should be evaluated.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.