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.
CVSS Details
- CVSS 3.1 Base Score: 7
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Oct 22, 2020 | Sep 23, 2020 |
| Debian | — | Upgrade xen | Oct 5, 2020 | Sep 23, 2020 |
| Gentoo Linux | — | Upgrade app-emulation/xen.Upgrade app-emulation/xen-tools. | Nov 12, 2020 | Sep 23, 2020 |
| Suse | — | Upgrade xen-libsUpgrade xen-toolsUpgrade xen-libs-32bitUpgrade xen-tools-xendomains-wait-diskUpgrade xen-develUpgrade xen-doc-htmlUpgrade xen-tools-domUUpgrade xen | Feb 7, 2021 | Sep 23, 2020 |
| Ubuntu | — | Upgrade xen-utils-4.11Upgrade xen-hypervisor-4.11-armhfUpgrade xen-hypervisor-4.11-amd64Upgrade libxenevtchn1Upgrade libxengnttab1Upgrade xen-utils-commonUpgrade libxendevicemodel1Upgrade libxenmisc4.11Upgrade xen-hypervisor-4.11-arm64Upgrade xenstore-utils | Sep 20, 2022 | Sep 23, 2020 |
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