An issue (known as XSA-212) was discovered in Xen, with fixes available for 4.8.x, 4.7.x, 4.6.x, 4.5.x, and 4.4.x. The earlier XSA-29 fix introduced an insufficient check on XENMEM_exchange input, allowing the caller to drive hypervisor memory accesses outside of the guest provided input/output arrays.
http://openwall.com/lists/oss-security/2017/04/04/3
http://www.debian.org/security/2017/dsa-3847
http://www.securityfocus.com/bid/97375
http://www.securitytracker.com/id/1038223
http://xenbits.xen.org/xsa/advisory-212.html
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-029-2017.txt
https://googleprojectzero.blogspot.com/2017/04/pandavirtualization-exploiting-xen.html
Source: MITRE
Published: 2017-04-04
Updated: 2019-10-03
Type: CWE-129
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: 8.2
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Impact Score: 6
Exploitability Score: 1.5
Severity: HIGH