Qubes OS has disclosed a critical vulnerability allowing arbitrary code execution through the copy-to-VM mechanism. The flaw resides in the error reporting backchannel, which can be exploited to bypass isolation boundaries between VMs. This issue is addressed in the newly released QSB-118 security bulletin.
- Apply Qubes OS security update QSB-118 immediately to patch the exploit.
- The vulnerability affects the copy-to-VM error reporting backchannel.
- Successful exploitation allows arbitrary code execution across VM boundaries.
- Review QSB-118 details for specific affected versions and remediation steps.