CVE-2020-25601

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Summary

CVECVE-2020-25601
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-09-23 22:15:00 UTC
Updated2023-11-07 03:20:00 UTC
DescriptionAn issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() / evtchn_destroy(). In particular, the FIFO event channel model allows guests to have a large number of event channels active at a time. Closing all of these (when resetting all event channels or when cleaning up after the guest) may take extended periods of time. So far, there was no arrangement for preemption at suitable intervals, allowing a CPU to spend an almost unbounded amount of time in the processing of these operations. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. All Xen versions are vulnerable in principle. Whether versions 4.3 and older are vulnerable depends on underlying hardware characteristics.

Risk And Classification

Problem Types: NVD-CWE-noinfo

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 10.0 All All All
Operating System Fedoraproject Fedora 31 All All All
Operating System Fedoraproject Fedora 32 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Fedoraproject Fedora 32 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Opensuse Leap 15.2 All All All
Operating System Opensuse Leap 15.2 All All All
Operating System Xen Xen All All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 32 Update: xen-4.13.1-6.fc32 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
Xen: Multiple vulnerabilities (GLSA 202011-06) — Gentoo security GENTOO security.gentoo.org
[SECURITY] Fedora 33 Update: xen-4.14.0-5.fc33 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 31 Update: xen-4.12.3-5.fc31 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
[SECURITY] Fedora 31 Update: xen-4.12.3-5.fc31 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 32 Update: xen-4.13.1-6.fc32 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org Third Party Advisory
XSA-344 - Xen Security Advisories MISC xenbits.xen.org Vendor Advisory
[security-announce] openSUSE-SU-2020:1608-1: important: Security update SUSE lists.opensuse.org Third Party Advisory
Debian -- Security Information -- DSA-4769-1 xen DEBIAN www.debian.org Third Party Advisory
[SECURITY] Fedora 33 Update: xen-4.14.0-5.fc33 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 198943 Ubuntu Security Notification for Xen Vulnerabilities (USN-5617-1)
  • 500792 Alpine Linux Security Update for xen
  • 501512 Alpine Linux Security Update for xen
  • 504536 Alpine Linux Security Update for xen
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