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CVE-2018-12893

Published: 2 July 2018

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.

Notes

AuthorNote
mdeslaur
hypervisor packages are in universe. For
issues in the hypervisor, add appropriate
tags to each section, ex:
Tags_xen: universe-binary

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
xen
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Needed

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Not vulnerable
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Not vulnerable
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
kinetic Not vulnerable
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
lunar Not vulnerable
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
mantic Not vulnerable
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
noble Not vulnerable
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
trusty Does not exist
(trusty was needs-triage)
upstream
Released (4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
xenial Needed

Binaries built from this source package are in Universe and so are supported by the community.

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Changed
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H