Executive Summary

Informations
Name CVE-2021-33033 First vendor Publication 2021-05-14
Vendor Cve Last vendor Modification 2021-06-09

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

The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33033

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-416 Use After Free

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 3385

Sources (Detail)

Source Url
MISC https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id...
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id...
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_...
https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e

Alert History

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Date Informations
2021-06-10 00:23:09
  • Multiple Updates
2021-06-05 01:44:32
  • Multiple Updates
2021-06-04 01:39:15
  • Multiple Updates
2021-06-03 01:40:11
  • Multiple Updates
2021-05-29 01:39:49
  • Multiple Updates
2021-05-25 09:22:51
  • Multiple Updates
2021-05-25 00:22:53
  • Multiple Updates
2021-05-18 05:22:47
  • Multiple Updates
2021-05-15 05:22:48
  • First insertion