CVE-2026-49188: ai_cmd Utility RCE Vulnerability

CVE-2026-49188 Overview

CVE-2026-49188 is a command injection vulnerability in the ai_cmd utility. The utility runs with full root privileges and pipes socket-derived input directly into popen(). This design allows unauthenticated attackers on an adjacent network to execute arbitrary commands as root. The flaw is classified under [CWE-489] (Active Debug Code / Leftover Debug Functionality), indicating the affected utility was likely left in an insecure state for diagnostic purposes.

Critical Impact
Unauthenticated adjacent-network attackers can achieve full root command execution on affected devices through the exposed ai_cmd socket interface.

Affected Products

Acer device firmware exposing the ai_cmd utility (see Acer Community Article)
Systems running the ai_cmd service as root
Devices reachable over an adjacent network segment where the socket is exposed

Discovery Timeline

2026-06-04 - CVE-2026-49188 published to NVD
2026-06-04 - Last updated in NVD database

Technical Details for CVE-2026-49188

Vulnerability Analysis

The ai_cmd utility operates as a privileged service listening on a network socket. It reads incoming data from connected clients and forwards that data to the popen() C library function without sanitization or argument separation. Because popen() spawns a shell to interpret its argument, any shell metacharacters in the socket input (such as ;, |, &&, or backticks) are evaluated by the shell. The resulting child process inherits the root privileges of the parent service.

The vulnerability requires no authentication and no user interaction. An attacker only needs network reachability to the listening socket on an adjacent network segment. This pattern is consistent with leftover debug or diagnostic functionality that was not removed before production deployment, aligning with the [CWE-489] classification.

Root Cause

The root cause is a combination of two defects. First, the service runs with elevated privileges that exceed its functional requirements. Second, untrusted input from a socket is passed unfiltered to a shell-invoking function. Neither input validation nor privilege separation was implemented to contain the impact of malicious input.

Attack Vector

An attacker on the same broadcast domain or otherwise reachable network connects to the ai_cmd socket. The attacker sends a payload containing shell metacharacters followed by an arbitrary command. The service hands the payload to popen(), the shell parses the metacharacters, and the injected command runs as root. The attacker can install persistence, exfiltrate credentials, or pivot deeper into the network.

No verified exploit code is publicly available. Refer to the Acer Community Article for vendor technical details.

Detection Methods for CVE-2026-49188

Indicators of Compromise

Unexpected child processes of the ai_cmd service, particularly shells such as /bin/sh or /bin/bash
Outbound connections initiated by processes parented to ai_cmd
New cron jobs, SSH keys, or system user accounts created shortly after socket connections to the ai_cmd port
Inbound TCP sessions to the ai_cmd listening port from unexpected hosts on the local segment

Detection Strategies

Monitor process creation events where the parent is ai_cmd and the child is a shell interpreter or network utility
Alert on any execution of popen()-spawned commands containing shell metacharacters originating from privileged daemons
Inspect network flows for connections to the ai_cmd port from non-administrative hosts
Correlate root-level command executions with preceding inbound socket activity on the affected device

Monitoring Recommendations

Enable verbose process auditing on affected devices using auditd or equivalent
Capture and retain network flow telemetry for the adjacent network segment hosting the device
Baseline normal ai_cmd activity and alert on deviations, including spikes in connection volume

How to Mitigate CVE-2026-49188

Immediate Actions Required

Restrict network access to the ai_cmd socket using host or network firewall rules until a vendor fix is applied
Isolate affected devices on a dedicated VLAN with strict ingress filtering
Audit running processes for evidence of prior exploitation, focusing on root-owned shells spawned by ai_cmd
Disable the ai_cmd service if it is not required for device operation

Patch Information

No patch identifier is published in the NVD record at this time. Consult the Acer Community Article for vendor remediation guidance and firmware updates. Apply vendor-supplied updates as soon as they become available.

Workarounds

Block the ai_cmd listening port at the network perimeter and on host firewalls
Remove or disable the ai_cmd binary if business requirements permit
Place affected devices behind a network access control list that permits only trusted management hosts

bash

# Example iptables rule to block adjacent-network access to the ai_cmd port
# Replace PORT with the actual ai_cmd listening port and TRUSTED_CIDR with management subnet
iptables -A INPUT -p tcp --dport PORT -s TRUSTED_CIDR -j ACCEPT
iptables -A INPUT -p tcp --dport PORT -j DROP