CVE-2020-25599

HIGH

Xen 4.5-4.14.x - Denial of Service and Privilege Escalation via evtchn_reset Race Condition

Title source: llm
STIX 2.1

Description

An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable.

References (8)

Core 8
Core References
Patch, Vendor Advisory x_refsource_misc
https://xenbits.xen.org/xsa/advisory-343.html
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2020/dsa-4769
Mailing List, Third Party Advisory vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.html
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202011-06
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2020/12/16/5

Scores

CVSS v3 7.0
EPSS 0.0007
EPSS Percentile 22.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-119 CWE-362
Status published
Products (6)
debian/debian_linux 10.0
fedoraproject/fedora 31
fedoraproject/fedora 32
fedoraproject/fedora 33
opensuse/leap 15.2
xen/xen 4.5.0 - 4.14.0
Published Sep 23, 2020
Tracked Since Feb 18, 2026