CVE-2021-28701
 
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
Another race in XENMAPSPACE_grant_table handling Guests are 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, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.
Otra carrera en el manejo de la función XENMAPSPACE_grant_table de los Huéspedes, se les permite el acceso a determinadas páginas de memoria propiedad de Xen. La mayoría de estas páginas permanecen asignadas / asociadas a un huésped durante toda su vida. Las páginas de estado de la tabla Grant v2, sin embargo, se desasignan cuando un huésped cambia (de nuevo) de v2 a v1. Una liberación de dichas páginas requiere que el hipervisor haga cumplir que ninguna petición paralela pueda resultar en la adición de un mapeo de dicha página a un huésped. Esta aplicación no existía, permitiendo a los huéspedes mantener el acceso a las páginas liberadas y quizás reusarlas para otros fines. Desafortunadamente, cuando fue preparada la XSA-379, no se advirtió este problema similar
CVSS Scores
SSVC
- Decision:-
Timeline
- 2021-03-18 CVE Reserved
- 2021-09-08 CVE Published
- 2023-03-08 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC
References (8)
URL | Tag | Source |
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http://www.openwall.com/lists/oss-security/2021/09/08/2 | Mailing List |
URL | Date | SRC |
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URL | Date | SRC |
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Xen Search vendor "Xen" | Xen Search vendor "Xen" for product "Xen" | >= 4.0.0 Search vendor "Xen" for product "Xen" and version " >= 4.0.0" | - |
Affected
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Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 34 Search vendor "Fedoraproject" for product "Fedora" and version "34" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 35 Search vendor "Fedoraproject" for product "Fedora" and version "35" | - |
Affected
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