CVE-2026-104809 Overview
CVE-2026-104809 is a shared object hijacking vulnerability affecting the Mitel Linux virtual machine. An attacker with local, high-privilege access can place a malicious .so file where a privileged process expects to load a legitimate module. The loader resolves modules by predictable name without verifying origin or integrity. The injected code then executes with the privileges of the loading process, resulting in arbitrary code execution and full compromise of the virtual machine. The weakness is classified under CWE-73: External Control of File Name or Path.
Critical Impact
Successful exploitation yields arbitrary code execution within a privileged process context and full compromise of the Mitel Linux virtual machine, including confidentiality, integrity, and availability of downstream subsystems.
Affected Products
- Mitel Linux virtual machine (specific product and version details not published in NVD at time of writing)
Discovery Timeline
- 2026-10-05 - CVE-2026-104809 published to NVD
- 2026-10-06 - Last updated in NVD database
- Vulnerability reported by DigitalCanion (Digital Canion Security Research)
Technical Details for CVE-2026-104809
Vulnerability Analysis
The flaw resides in how a privileged Mitel process resolves and loads a shared object module. The loader references a predictable module name and does not validate that the file originates from a trusted location or matches an expected signature or hash. An attacker who can write to a directory consulted during module resolution can stage a malicious .so using the expected name. When the privileged process loads the module, the attacker-supplied constructor runs within the host process. This grants arbitrary code execution and lateral control over the Mitel Linux virtual machine.
Root Cause
The root cause is external control of a file path used for library loading, categorized as [CWE-73]. The module-loading routine trusts filename-based resolution without integrity checks such as cryptographic signature verification, canonical path enforcement, or a hardcoded absolute path to a protected directory. Any writable location in the search order becomes an injection point.
Attack Vector
The attack vector is local. The attacker needs existing high-privilege access on the target virtual machine to stage the malicious shared object in a location consulted by the loader. No user interaction is required. Because the loading process runs with elevated privileges, successful exploitation enables full compromise of the virtual machine and any downstream services it manages.
No verified public exploit code is available. See the Digital Canion Security Research advisory for additional technical context.
Stop Remote Code Execution Before It Runs
Singularity™ Endpoint detects and blocks exploit attempts at machine speed, including zero-days and novel attack techniques.
Stop Exploit AttemptsDetection Methods for CVE-2026-104809
Indicators of Compromise
- Presence of unexpected .so files in directories referenced by the Mitel module loader or in writable paths within LD_LIBRARY_PATH.
- Unsigned or recently modified shared objects whose names match legitimate Mitel modules but reside outside standard package locations.
- Privileged Mitel processes spawning unexpected child processes, opening outbound network sockets, or writing to atypical filesystem paths.
Detection Strategies
- Monitor open(), openat(), and mmap() syscalls for shared object loads originating from non-standard directories using auditd or eBPF tooling.
- Baseline the set of shared objects loaded by Mitel privileged services and alert on deviations in path, hash, or signer.
- Correlate filesystem write events in library search paths with subsequent module load events by privileged processes.
Monitoring Recommendations
- Enable file integrity monitoring on all directories consulted by the Mitel module loader.
- Forward process execution and library load telemetry to a centralized analytics platform for retrospective hunting.
- Review package manager logs and configuration management diffs for unauthorized changes to Mitel binaries or modules.
How to Mitigate CVE-2026-104809
Immediate Actions Required
- Restrict write access to all directories referenced by the Mitel module loader to the service account and root only.
- Audit existing shared objects in Mitel library paths and remove any file not provided by a signed vendor package.
- Rotate credentials and inspect privileged accounts for signs of prior misuse until a vendor patch is applied.
Patch Information
At the time of publication no fixed version information was listed in NVD. Monitor the Digital Canion Security Research advisory and Mitel security bulletins for release notes referencing CVE-2026-104809, and apply vendor-supplied updates as soon as they become available.
Workarounds
- Enforce absolute paths and strict permissions on directories consulted by the module loader, removing world-writable or group-writable attributes.
- Where supported, enable mandatory access controls such as SELinux or AppArmor policies that constrain which files the privileged Mitel process may load.
- Isolate the Mitel Linux virtual machine on a dedicated management network and limit interactive shell access to a minimal administrator set.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
