CVE-2020-27671

HIGH

Xen 4.2.0-4.14.x - Denial of Service and Privilege Escalation via IOMMU TLB Flush Mishandling

Title source: llm
STIX 2.1

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.

References (8)

Core 8
Core References
Patch, Vendor Advisory x_refsource_confirm
http://xenbits.xen.org/xsa/advisory-346.html
Patch, Vendor Advisory x_refsource_misc
https://xenbits.xen.org/xsa/advisory-346.html
Mailing List, Third Party Advisory vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.html
Mailing List, Third Party Advisory vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.html
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202011-06
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2020/dsa-4804
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/01/19/8

Scores

CVSS v3 7.8
EPSS 0.0007
EPSS Percentile 21.7%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Details

Status published
Products (5)
debian/debian_linux 10.0
fedoraproject/fedora 31
opensuse/leap 15.1
opensuse/leap 15.2
xen/xen 4.2.0 - 4.14.0
Published Oct 22, 2020
Tracked Since Feb 18, 2026