CVEvulnerability
CVE-2018-12893
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2018-07-02
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.0 ([email protected])
- 6.5 MEDIUM — CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 2.1 LOW — AV:L/AC:L/Au:N/C:N/I:N/A:P
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.
Affected configurations
• xen xen (<= 4.10.0)
• debian debian linux 9.0
References
- http://www.openwall.com/lists/oss-security/2018/06/27/11 Mailing List, Mitigation, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/104572 Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041202 Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-265.html Mitigation, Patch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1590979 Issue Tracking, Mitigation, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html lists.debian.org
- https://security.gentoo.org/glsa/201810-06 security.gentoo.org
- https://support.citrix.com/article/CTX235748 Vendor Advisory
- https://www.debian.org/security/2018/dsa-4236 Third Party Advisory
- http://www.openwall.com/lists/oss-security/2018/06/27/11 Mailing List, Mitigation, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/104572 Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041202 Third Party Advisory, VDB Entry
- http://xenbits.xen.org/xsa/advisory-265.html Mitigation, Patch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1590979 Issue Tracking, Mitigation, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html lists.debian.org
- https://security.gentoo.org/glsa/201810-06 security.gentoo.org
- https://support.citrix.com/article/CTX235748 Vendor Advisory
- https://www.debian.org/security/2018/dsa-4236 Third Party Advisory