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Vulnerability Details : CVE-2021-26933

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.
Publish Date : 2021-02-17 Last Update Date : 2021-04-11
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- CVSS Scores & Vulnerability Types

CVSS Score
2.1
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID CWE id is not defined for this vulnerability

- Products Affected By CVE-2021-26933

# Product Type Vendor Product Version Update Edition Language
1 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
3 OS XEN XEN * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fedoraproject Fedora 2
XEN XEN 1

- References For CVE-2021-26933

https://www.debian.org/security/2021/dsa-4888
DEBIAN DSA-4888
https://lists.fedoraproject.org/archives/list/[email protected]/message/4GELN5E6MDR5KQBJF5M5COUUED3YFZTD/
FEDORA FEDORA-2021-4c819bf1ad
http://xenbits.xen.org/xsa/advisory-364.html
https://lists.fedoraproject.org/archives/list/[email protected]/message/EOAJBVAVR6RSCUCHNXPVSNRPSFM7INMP/
FEDORA FEDORA-2021-47f53a940a

- Metasploit Modules Related To CVE-2021-26933

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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