CVE-2018-12893 — Vulnetix

CVE-2018-12893 PUBLISHED

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.

EPSS 0.07% · 21.5th percentile

Risk Scores

EPSS Score

0.07%

21.5th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:16.04:LTS	xen	0, 4.5.1-0ubuntu1, 4.5.1-0ubuntu2
Ubuntu:18.04:LTS	xen	0, 4.9.0-0ubuntu3, 4.9.0-0ubuntu4

Timeline

Jul 2, 2018 CVE Published
Apr 14, 2021 EPSS Score
Jun 22, 2021 EPSS Score
Aug 23, 2021 EPSS Score
Oct 24, 2021 EPSS Score
Dec 25, 2021 EPSS Score
Feb 4, 2022 EPSS Score
Feb 25, 2022 EPSS Score
Apr 28, 2022 EPSS Score
Aug 31, 2022 EPSS Score
Nov 1, 2022 EPSS Score
Jan 2, 2023 EPSS Score

References

https://ubuntu.com/security/CVE-2018-12893 third-party-advisory
https://xenbits.xen.org/xsa/advisory-265.html third-party-advisory
https://www.cve.org/CVERecord?id=CVE-2018-12893 third-party-advisory

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