The xen_biovec_phys_mergeable function in drivers/xen/biomerge.c in Xen might allow local OS guest users to corrupt block device data streams and consequently obtain sensitive memory information, cause a denial of service, or gain host OS privileges by leveraging incorrect block IO merge-ability calculation.
http://www.debian.org/security/2017/dsa-3981
http://www.openwall.com/lists/oss-security/2017/08/15/4
http://www.securityfocus.com/bid/100343
http://www.securitytracker.com/id/1039176
http://xenbits.xen.org/xsa/advisory-229.html
https://bugzilla.redhat.com/show_bug.cgi?id=1477656
https://security.gentoo.org/glsa/201801-14
https://support.citrix.com/article/CTX225941
Source: MITRE
Published: 2017-08-24
Updated: 2019-10-03
Type: CWE-682
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 8.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Impact Score: 6
Exploitability Score: 2
Severity: HIGH