CVE-2020-27671

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-22 · updated 2026-06-17

Description

An issue was discovered in Xen through 4.14.x allowing x86 HVM and PVH guest OS users to cause a denial of service (data corruption), cause a data leak, or possibly gain privileges because coalescing of per-page IOMMU TLB flushes is mishandled.

Affected products

Debian Linux: 10.0
Fedoraproject Fedora: 31
openSUSE Leap: 15.1, 15.2
xen: from 4.2.0 through 4.14.0

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.html
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.html
http://www.openwall.com/lists/oss-security/2021/01/19/8
http://xenbits.xen.org/xsa/advisory-346.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
https://security.gentoo.org/glsa/202011-06
https://www.debian.org/security/2020/dsa-4804
https://xenbits.xen.org/xsa/advisory-346.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.html
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.html
http://www.openwall.com/lists/oss-security/2021/01/19/8
http://xenbits.xen.org/xsa/advisory-346.html

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