CVE-2021-26933
Xen Arm Cache Timing Side-Channel Vulnerability
Description
An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory accesses are bypassing the cache. This means that Xen needs to ensure that all writes (such as the ones during scrubbing) have reached the memory before handing over the page to a guest. Unfortunately, the operation to clean the cache is happening before checking if the page was scrubbed. Therefore there is no guarantee when all the writes will reach the memory.
INFO
Published Date :
Feb. 17, 2021, 2:15 a.m.
Last Modified :
Nov. 7, 2023, 3:31 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
Affected Products
The following products are affected by CVE-2021-26933
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-26933.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-26933 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-26933 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4GELN5E6MDR5KQBJF5M5COUUED3YFZTD/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOAJBVAVR6RSCUCHNXPVSNRPSFM7INMP/ [No types assigned] Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/EOAJBVAVR6RSCUCHNXPVSNRPSFM7INMP/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/4GELN5E6MDR5KQBJF5M5COUUED3YFZTD/ -
Modified Analysis by [email protected]
May. 27, 2022
Action Type Old Value New Value Changed Reference Type https://www.debian.org/security/2021/dsa-4888 No Types Assigned https://www.debian.org/security/2021/dsa-4888 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Apr. 11, 2021
Action Type Old Value New Value Added Reference https://www.debian.org/security/2021/dsa-4888 [No Types Assigned] -
Initial Analysis by [email protected]
Feb. 26, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Changed Reference Type http://xenbits.xen.org/xsa/advisory-364.html No Types Assigned http://xenbits.xen.org/xsa/advisory-364.html Patch, Vendor Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/4GELN5E6MDR5KQBJF5M5COUUED3YFZTD/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/4GELN5E6MDR5KQBJF5M5COUUED3YFZTD/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/EOAJBVAVR6RSCUCHNXPVSNRPSFM7INMP/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/EOAJBVAVR6RSCUCHNXPVSNRPSFM7INMP/ Mailing List, Third Party Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:xen:xen:*:*:*:*:*:*:arm:* versions from (including) 4.9.0 up to (including) 4.14.1 Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 26, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/EOAJBVAVR6RSCUCHNXPVSNRPSFM7INMP/ [No Types Assigned] Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/4GELN5E6MDR5KQBJF5M5COUUED3YFZTD/ [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-26933 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-26933
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.12382
percentile