CVE-2020-29566

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Summary

CVECVE-2020-29566
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-12-15 17:15:00 UTC
Updated2023-11-07 03:21:00 UTC
DescriptionAn issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.

Risk And Classification

Problem Types: CWE-674

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 32 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Xen Xen All All All All

References

ReferenceSourceLinkTags
Debian -- Security Information -- DSA-4812-1 xen DEBIAN www.debian.org Third Party Advisory
[SECURITY] Fedora 33 Update: xen-4.14.0-14.fc33 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
XSA-348 - Xen Security Advisories MISC xenbits.xenproject.org Patch, Vendor Advisory
Xen: Multiple vulnerabilities (GLSA 202107-30) — Gentoo security GENTOO security.gentoo.org
[SECURITY] Fedora 32 Update: xen-4.13.2-5.fc32 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org Mailing List, Third Party Advisory
[SECURITY] Fedora 32 Update: xen-4.13.2-5.fc32 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 33 Update: xen-4.14.0-14.fc33 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org Mailing List, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 500796 Alpine Linux Security Update for xen
  • 501515 Alpine Linux Security Update for xen
  • 504539 Alpine Linux Security Update for xen
  • 710038 Gentoo Linux Xen Multiple vulnerabilities (GLSA 202107-30)
  • 750465 OpenSUSE Security Update for xen (openSUSE-SU-2020:2331-1)
  • 750474 OpenSUSE Security Update for xen (openSUSE-SU-2020:2313-1)
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