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Vulnerability of Xen, Linux: memory corruption via Linux Blkback Grant Mapping

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a memory corruption via Linux Blkback Grant Mapping of Xen, in order to trigger a denial of service, and possibly to run code on the host system.
Impacted products: XenServer, Debian, Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this bulletin: 2/4.
Creation date: 16/02/2021.
Références of this threat: CERTFR-2021-AVI-152, CERTFR-2021-AVI-185, CERTFR-2021-AVI-191, CTX296603, CVE-2021-26930, DLA-2586-1, DLA-2610-1, FEDORA-2021-7143aca8cb, FEDORA-2021-8d45d297c6, openSUSE-SU-2021:0393-1, SUSE-SU-2021:0735-1, SUSE-SU-2021:0736-1, SUSE-SU-2021:0737-1, SUSE-SU-2021:0738-1, SUSE-SU-2021:0740-1, SUSE-SU-2021:0741-1, SUSE-SU-2021:0743-1, SUSE-SU-2021:0744-1, VIGILANCE-VUL-34593, XSA-365.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a memory corruption via Linux Bl...
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This threat note impacts software or systems such as XenServer, Debian, Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

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

Solutions for this threat 

This vulnerability fix will be public soon.
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