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Vulnerability of Linux kernel: use after free via Xen xen-netback xenvif_connect_data

Synthesis of the vulnerability 

An attacker, inside a guest system, can force the usage of a freed memory area via Xen xen-netback xenvif_connect_data() of the Linux kernel, in order to trigger a denial of service, and possibly to run code on the host system.
Vulnerable systems: Linux.
Severity of this threat: 2/4.
Creation date: 08/06/2021.
Références of this weakness: CERTFR-2021-AVI-453, CVE-2021-28691, VIGILANCE-VUL-35654, XSA-374.

Description of the vulnerability 

An attacker, inside a guest system, can force the usage of a freed memory area v...
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This computer weakness impacts software or systems such as Linux.

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

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

An attacker with a expert ability can exploit this cybersecurity threat.

Solutions for this threat 

This vulnerability solution will be public soon.
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