CVE-2021-28697

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Summary

CVECVE-2021-28697
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-08-27 19:15:00 UTC
Updated2023-11-07 03:32:00 UTC
Descriptiongrant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes.

Risk And Classification

Problem Types: CWE-362

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 11.0 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Fedoraproject Fedora 34 All All All
Operating System Fedoraproject Fedora 35 All All All
Operating System Xen Xen All All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 33 Update: xen-4.14.2-3.fc33 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 33 Update: xen-4.14.2-3.fc33 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
FEDORA-2021-081f9bf5d2 FEDORA lists.fedoraproject.org
Xen: Multiple Vulnerabilities (GLSA 202208-23) — Gentoo security GENTOO security.gentoo.org
xenbits.xenproject.org/xsa/advisory-379.txt MISC xenbits.xenproject.org
Debian -- Security Information -- DSA-4977-1 xen DEBIAN www.debian.org
[SECURITY] Fedora 34 Update: xen-4.14.2-3.fc34 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
[SECURITY] Fedora 34 Update: xen-4.14.2-3.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
[SECURITY] Fedora 35 Update: xen-4.15.0-6.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Array

Legacy QID Mappings

  • 178798 Debian Security Update for xen (DSA 4977-1)
  • 183059 Debian Security Update for xen (CVE-2021-28697)
  • 281879 Fedora Security Update for xen (FEDORA-2021-4f129cc0c1)
  • 281880 Fedora Security Update for xen (FEDORA-2021-d68ed12e46)
  • 379051 Citrix XenServer Security Updates (CTX325319)
  • 390249 Oracle Managed Virtualization (VM) Server for x86 Security Update for xen (OVMSA-2021-0033)
  • 500801 Alpine Linux Security Update for xen
  • 501519 Alpine Linux Security Update for xen
  • 501797 Alpine Linux Security Update for xen
  • 504544 Alpine Linux Security Update for xen
  • 710600 Gentoo Linux Xen Multiple Vulnerabilities (GLSA 202208-23)
  • 751074 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2925-1)
  • 751083 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2924-1)
  • 751085 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2943-1)
  • 751087 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2955-1)
  • 751100 OpenSUSE Security Update for xen (openSUSE-SU-2021:2923-1)
  • 751103 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2957-1)
  • 751111 OpenSUSE Security Update for xen (openSUSE-SU-2021:1236-1)
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