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
Author | Note |
---|---|
mdeslaur | hypervisor packages are in universe. For issues in the hypervisor, add appropriate tags to each section, ex: Tags_xen: universe-binary |
Priority
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)
|
|
trusty |
Does not exist
(trusty was needs-triage)
|
|
upstream |
Released
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
|
|
groovy |
Ignored
(end of life)
|
|
xenial |
Needed
|
|
impish |
Ignored
(end of life)
|
|
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)
|
|
focal |
Not vulnerable
(4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9)
|
|
hirsute |
Ignored
(end of life)
|
|
jammy |
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)
|
|
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 |