CVE-2026-15710 Netskope CVE debrief

Who should care

Defenders responsible for securing Netskope Client for Windows installations, particularly those with Endpoint DLP component deployed, should assess exposure and implement compensating controls.

Why it matters

This vulnerability allows local unprivileged attackers to exploit the Endpoint DLP component of Netskope Client for Windows, potentially leading to information leakage and privilege escalation.

• Local unprivileged attackers could enumerate DLP configuration and feature flags
• Local unprivileged attackers could extract live session tokens
• Local unprivileged attackers could read kernel memory fragments from other users' operations
• Defenders need to verify exposure and implement compensating controls

Technical summary

An internal communication channel used by the user-space hook DLL to pass messages through the kernel driver to the daemon lacked proper token-based message validation, allowing local unprivileged processes to send unauthorized queries. Additionally, a reply buffer used by the port message handler was not properly initialized before returning data, leaking residual kernel pool memory from prior allocations.

Defensive priority

Defenders should prioritize verifying exposure and implementing compensating controls, as the vulnerability allows local unprivileged processes to send unauthorized queries and leak residual kernel pool memory.

Recommended defensive actions

• Verify exposure by checking if the Endpoint DLP component is installed and if the version is prior to R141
• Implement compensating controls, such as restricting access to the kernel driver and monitoring for suspicious activity
• Apply the patch or upgrade to version R141 or later
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score of 6.8, and affected component, the Endpoint DLP component (epdlpdrv.sys) of Netskope Client for Windows prior to version R141. The internal communication channel used by the user-space hook DLL to pass messages through the kernel driver to the daemon lacked proper token-based message validation. A reply buffer used by the port message handler was not properly initialized before returning data, leaking residual kernel pool memory.

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.