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Vulnerability of Xen: privilege escalation via Inappropriate X86 IOMMU Timeout

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via Inappropriate X86 IOMMU Timeout of Xen, in order to escalate his privileges on the host system.
Vulnerable software: XenServer, Debian, Fedora, Xen.
Severity of this announce: 2/4.
Creation date: 08/06/2021.
Références of this computer vulnerability: CERTFR-2021-AVI-453, CERTFR-2021-AVI-460, CTX316324, CVE-2021-28692, DSA-4931-1, FEDORA-2021-41d4347447, FEDORA-2021-993693c914, VIGILANCE-VUL-35653, XSA-373.

Description of the vulnerability 

An attacker, inside a guest system, can bypass restrictions via Inappropriate X8...
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This cybersecurity alert impacts software or systems such as XenServer, Debian, Fedora, Xen.

Our Vigil@nce team determined that the severity of this weakness is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this security weakness.

Solutions for this threat 

Workarounds for this vulnerability are not yet public.
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