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.

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

Details

Risk Information

CVSS v2

CVSS v3