CVEvulnerability

CVE-2020-25599

7.0 HIGH Published 2020-09-23 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-09-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
4.4 MEDIUM — AV:L/AC:M/Au:N/C:P/I:P/A:P
Weaknesses
CWE-119, CWE-362

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.

Affected configurations

• xen xen (>= 4.5.0 <= 4.14.0) • fedoraproject fedora 31 • fedoraproject fedora 32 • fedoraproject fedora 33 • opensuse leap 15.2 • debian debian linux 10.0

Related

Weakness · CWE (2)

  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness

References