CVE-2018-12891

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.43% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 36.3% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2018-07-02 17:00Z8 YR AGO

Last updated

2024-08-05 08:45Z2 YR AGO

Reserved

2018-06-26

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-358Improperly Implemented Security Check for StandardBase

Data version

5.1

Document digest

3a3c03280c3c5e9a4f669f1d72ab8575f52303b333777bbc06b115154d506792

• www.debian.orgDSA-4236https://www.debian.org/security/2018/dsa-4236vendor-advisoryx_refsource_DEBIAN
• support.citrix.comhttps://support.citrix.com/article/CTX235748x_refsource_CONFIRM
• security.gentoo.orgGLSA-201810-06https://security.gentoo.org/glsa/201810-06vendor-advisoryx_refsource_GENTOO
• lists.debian.org[debian-lts-announce] 20181112 [SECURITY] [DLA 1577-1] xen security updatehttps://lists.debian.org/debian-lts-announce/2018/11/msg00013.htmlmailing-listx_refsource_MLIST
• xenbits.xen.orghttp://xenbits.xen.org/xsa/advisory-264.htmlx_refsource_CONFIRM
• www.securitytracker.com1041201http://www.securitytracker.com/id/1041201vdb-entryx_refsource_SECTRACK
• www.openwall.com[oss-security] 20180627 Xen Security Advisory 264 (CVE-2018-12891) - preemption checks bypassed in x86 PV MM handlinghttp://www.openwall.com/lists/oss-security/2018/06/27/10mailing-listx_refsource_MLIST
• www.securityfocus.com104570http://www.securityfocus.com/bid/104570vdb-entryx_refsource_BID