Executive Summary

Informations
Name CVE-2021-28691 First vendor Publication 2021-06-29
Vendor Cve Last vendor Modification 2021-08-05

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7.8
Base Score 7.8 Environmental Score 7.8
impact SubScore 5.9 Temporal Score 7.8
Exploitabality Sub Score 1.8
 
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged 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:L/Au:N/C:P/I:P/A:P)
Cvss Base Score 4.6 Attack Range Local
Cvss Impact Score 6.4 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28691

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-416 Use After Free

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 3399

Sources (Detail)

Source Url
CONFIRM https://security.netapp.com/advisory/ntap-20210805-0002/
GENTOO https://security.gentoo.org/glsa/202107-30
MISC https://xenbits.xenproject.org/xsa/advisory-374.txt

Alert History

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Date Informations
2021-08-26 12:42:52
  • Multiple Updates
2021-08-24 01:43:23
  • Multiple Updates
2021-08-19 12:43:43
  • Multiple Updates
2021-08-05 17:22:59
  • Multiple Updates
2021-08-05 01:42:40
  • Multiple Updates
2021-07-12 12:40:53
  • Multiple Updates
2021-07-06 21:23:11
  • Multiple Updates
2021-06-29 17:22:51
  • First insertion