Executive Summary
| Informations | |||
|---|---|---|---|
| Name | CVE-2021-28701 | First vendor Publication | 2021-09-08 |
| Vendor | Cve | Last vendor Modification | 2023-11-07 |
Security-Database Scoring CVSS v3
| Cvss vector : CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | |||
|---|---|---|---|
| Overall CVSS Score | 7.8 | ||
| Base Score | 7.8 | Environmental Score | 7.8 |
| impact SubScore | 6 | Temporal Score | 7.8 |
| Exploitabality Sub Score | 1.1 | ||
| Attack Vector | Local | Attack Complexity | High |
| Privileges Required | Low | User Interaction | None |
| Scope | Changed | Confidentiality Impact | High |
| Integrity Impact | High | Availability Impact | High |
| Calculate full CVSS 3.0 Vectors scores | |||
Security-Database Scoring CVSS v2
| Cvss vector : (AV:L/AC:M/Au:N/C:P/I:P/A:P) | |||
|---|---|---|---|
| Cvss Base Score | 4.4 | Attack Range | Local |
| Cvss Impact Score | 6.4 | Attack Complexity | Medium |
| Cvss Expoit Score | 3.4 | Authentication | None Required |
| Calculate full CVSS 2.0 Vectors scores | |||
Detail
| 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. |
Original Source
| Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28701 |
CWE : Common Weakness Enumeration
| % | Id | Name |
|---|---|---|
| 100 % | CWE-362 | Race Condition |
CPE : Common Platform Enumeration
| Type | Description | Count |
|---|---|---|
| Os | 1 | |
| Os | 3 | |
| Os | 1 |
Sources (Detail)
Alert History
| Date | Informations |
|---|---|
| 2023-11-07 21:34:04 |
|
| 2022-10-28 21:27:51 |
|
| 2022-08-15 17:27:47 |
|
| 2022-07-13 17:27:38 |
|
| 2021-12-17 00:23:11 |
|
| 2021-09-25 09:23:09 |
|
| 2021-09-21 17:22:59 |
|
| 2021-09-18 05:22:56 |
|
| 2021-09-17 00:23:03 |
|
| 2021-09-16 00:22:57 |
|
| 2021-09-08 21:23:16 |
|
