Qubes OS before qubes-core-dom0-linux 4.3.22 allows OS command injection during a qvm-copy-to-vm call from dom0 to an attacker-controlled qube,… (CVE-2026-82636)
Description
Qubes OS versions prior to qubes-core-dom0-linux 4.3.22 contain a vulnerability that allows OS command injection during a qvm-copy-to-vm call from dom0 to an attacker-controlled qube. The issue arises because the system library function is used to process an error message that may include shell metacharacters, leading to potential command execution.
CVSS v3.1
Score 7.9high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-82636) affects Qubes OS before qubes-core-dom0-linux 4.3.22. It allows an attacker controlling a qube to exploit OS command injection during the qvm-copy-to-vm operation from dom0. The root cause is the use of the system() function to handle error messages containing shell metacharacters in the core-admin-linux/file-copy-vm/qfile-dom0-agent.c source file. The CVSS 3.1 score is 7.9, indicating high severity with impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation could allow an attacker with control over a qube to execute arbitrary OS commands in dom0, potentially compromising the entire system's security, including confidentiality, integrity, and availability of the host environment.
Mitigation Recommendations
A fix is available in qubes-core-dom0-linux version 4.3.22. Users should upgrade to version 4.3.22 or later to remediate this vulnerability. No other mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-ppf9-cgjm-478m
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-82636"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a94611bacd9273b49c9248f
Added to database: 08/30/2026, 16:58:03 UTC
Last enriched: 09/08/2026, 00:37:49 UTC
Last updated: 10/13/2026, 18:48:24 UTC
Views: 133
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