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.
Published 2021-09-08 14:15:09
Updated 2022-10-28 16:20:05
Source Xen Project
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-28701

Probability of exploitation activity in the next 30 days: 0.05%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 12 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-28701

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
4.4
MEDIUM AV:L/AC:M/Au:N/C:P/I:P/A:P
3.4
6.4
NIST
7.8
HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
1.1
6.0
NIST

CWE ids for CVE-2021-28701

References for CVE-2021-28701

Products affected by CVE-2021-28701

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