CVE-2018-12893 | BDVDB-2026-103240 Detail
Description#
An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.
Impact#
No impact statement in the source data.
Weaknesses#
No weakness recorded in the source data.
References#
- http://www.openwall.com/lists/oss-security/2018/06/27/11
- https://www.debian.org/security/2018/dsa-4236
- https://support.citrix.com/article/CTX235748
- https://security.gentoo.org/glsa/201810-06
- https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1590979
- http://xenbits.xen.org/xsa/advisory-265.html
- http://www.securityfocus.com/bid/104572
- http://www.securitytracker.com/id/1041202
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.