Vulnerability CVE-2018-14678
Published: 2018-07-28

Description:
An issue was discovered in the Linux kernel through 4.17.11, as used in Xen through 4.11.x. The xen_failsafe_callback entry point in arch/x86/entry/entry_64.S does not properly maintain RBX, which allows local users to cause a denial of service (uninitialized memory usage and system crash). Within Xen, 64-bit x86 PV Linux guest OS users can trigger a guest OS crash or possibly gain privileges.

Type:

CWE-665

 (Improper Initialization)

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
XEN -> XEN 
Linux -> Linux kernel 
Debian -> Debian linux 

 References:
http://www.securityfocus.com/bid/104924
http://www.securitytracker.com/id/1041397
https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
https://usn.ubuntu.com/3931-1/
https://usn.ubuntu.com/3931-2/
https://www.debian.org/security/2018/dsa-4308
https://xenbits.xen.org/xsa/advisory-274.html
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