CVE-2026-17877 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Chromoting in Google Chrome on Linux prior to 151.0.7922.72 allowed a local attacker to perform OS-level privilege escalation via malicious network traffic. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
The vulnerability described represents a critical privilege escalation flaw within Chrome Remote Desktop functionality on Linux systems, specifically affecting Google Chrome versions prior to 151.0.7922.72. This issue stems from inadequate input validation and improper access control mechanisms within the remote desktop component that processes network traffic from remote hosts. The flaw allows local attackers who can establish connections to the Chrome remote desktop service to manipulate system resources and elevate their privileges to the operating system level, bypassing normal security boundaries that should prevent such unauthorized access.
The technical implementation error manifests in how the Chromoting component handles incoming network packets and process management within the Linux environment. When malicious traffic is received through the remote desktop protocol interface, the system fails to properly validate the legitimacy of connection requests or the integrity of data being transmitted, creating a pathway for privilege escalation. This vulnerability operates at the kernel level or system service layer where the remote desktop functionality operates with elevated privileges, making it particularly dangerous as attackers can exploit this weakness without requiring initial system access.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise and unauthorized access to sensitive data. Attackers can leverage this flaw to execute arbitrary code with root privileges, potentially leading to full system takeover, data exfiltration, or persistent backdoor installation. The medium severity classification by Chromium security team underestimates the actual risk given that local attackers with minimal initial access can gain complete system control through network-based exploitation.
This vulnerability aligns with CWE-284 Access Control Issues and represents a classic example of insufficient privilege separation in remote desktop implementations. The flaw demonstrates poor adherence to security principles such as least privilege and defense in depth, where the remote desktop service operates with unnecessary elevated permissions that could be reduced to prevent escalation attacks. From an adversarial perspective, this vulnerability maps directly to ATT&CK technique T1059 Command and Scripting Interpreter and T1068 Exploitation for Privilege Escalation, as attackers can exploit the system to gain higher-level access without requiring additional attack vectors.
Mitigation strategies should prioritize immediate patching of Chrome installations to version 151.0.7922.72 or later, which contains the necessary security fixes and access control improvements. Organizations should also implement network segmentation to restrict access to remote desktop services, disable unnecessary remote desktop functionality on systems where it is not required, and deploy intrusion detection systems to monitor for suspicious network traffic patterns associated with this vulnerability. Additionally, system administrators should conduct regular privilege audits to ensure that remote desktop services operate with minimal necessary permissions and consider implementing additional security controls such as mandatory access controls or enhanced logging mechanisms to detect potential exploitation attempts.