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Fencer Vulns
high 7.0

CVE-2020-27672 json

An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of service, achieve data corruption, or…

published 2020-10-22 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20176

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of service, achieve data corruption, or possibly gain privileges by exploiting a race condition that leads to a use-after-free involving 2MiB and 1GiB superpages.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.14.0+80-gd101b417b7-1

debian advisories DEBIAN-CVE-2020-27672

  • xen SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.7.6_12-43.70.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.11.4_14-2.45.1
  • xen SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.9.4_14-3.77.1
  • xen SLES for SAP 15, SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 4.10.4_22-3.50.1
  • xen SLE Module for Server Applications 15 SP2, SLE Module for Basesystem 15 SP2 4.13.2_04-3.19.1
  • xen SLE Module for Server Applications 15 SP1, SLE Module for Basesystem 15 SP1 4.12.4_04-3.37.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.11.4_10-2.39.2
  • xen SLES for SAP 15, SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 4.10.4_18-3.44.1

suse advisories SUSE-SU-2020:3742-1SUSE-SU-2020:14557-1SUSE-SU-2020:3653-1SUSE-SU-2020:3631-1SUSE-SU-2020:3627-1SUSE-SU-2020:3615-1

  • xen openSUSE Tumbleweed 4.15.1_01-1.2
  • xen openSUSE Leap 15.1 4.12.4_04-lp151.2.33.1
  • xen openSUSE Leap 15.2 4.13.2_04-lp152.2.18.1
  • xen openSUSE Leap 15.1 4.12.3_10-lp151.2.27.1
  • xen openSUSE Leap 15.2 4.13.1_10-lp152.2.12.1

opensuse advisories openSUSE-SU-2024:11520-1openSUSE-SU-2020:2192-1openSUSE-SU-2020:2162-1openSUSE-SU-2020:1844-1openSUSE-SU-2020:1783-1

  • xen Alpine 3.10 4.12.4-r0
  • xen Alpine 3.12, Alpine 3.11 4.13.2-r0
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 4.14.0-r2

alpine advisories ALPINE-CVE-2020-27672

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-27672 updated cvss 7.8

xen: x86: race condition in Xen mapping code (XSA-345)

  • Red Hat Enterprise Linux 5 kernel-xen
    not affected: vulnerable code not present “Running all guests in HVM or PVH mode, in each case with HAP enabled, will prevent those guests from exploiting the vulnerability.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-416 Use After Free

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.