CVE-2021-33033

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-33033
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-05-14 23:15:09 UTC
Updated2026-08-05 18:35:52 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:L/AC:L/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7 af854a3a-2127-422b-91ae-364da2661108 cdn.kernel.org Mailing List, Patch, Vendor Advisory
SyzScope - KASAN: use-after-free Read in cipso_v4_genopt af854a3a-2127-422b-91ae-364da2661108 sites.google.com Exploit, Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
KASAN: use-after-free Read in cipso_v4_genopt af854a3a-2127-422b-91ae-364da2661108 syzkaller.appspot.com Exploit, Mailing List, Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14 af854a3a-2127-422b-91ae-364da2661108 cdn.kernel.org Mailing List, Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159304 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9349)
  • 159305 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9351)
  • 159306 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9362)
  • 159307 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9363)
  • 159310 Oracle Enterprise Linux Security Update for kernel (ELSA-2021-2725)
  • 179118 Debian Security Update for linux (DLA 2940-1)
  • 180016 Debian Security Update for linux (CVE-2021-33033)
  • 198398 Ubuntu Security Notification for Linux kernel vulnerabilities (USN-4979-1)
  • 198403 Ubuntu Security Notification for Linux kernel vulnerabilities (USN-4984-1)
  • 239523 Red Hat Update for kernel-rt (RHSA-2021:2726)
  • 239524 Red Hat Update for kernel (RHSA-2021:2725)
  • 239879 Red Hat Update for kernel-rt (RHSA-2021:4140)
  • 257100 CentOS Security Update for kernel (CESA-2021:2725)
  • 352366 Amazon Linux Security Advisory for kernel: ALAS-2021-1503
  • 353242 Amazon Linux Security Advisory for kernel : ALAC2012-2022-036
  • 353243 Amazon Linux Security Advisory for kmod-mlx5 : ALAC2012-2022-037
  • 353244 Amazon Linux Security Advisory for kmod-sfc : ALAC2012-2022-038
  • 670488 EulerOS Security Update for kernel (EulerOS-SA-2021-2246)
  • 670514 EulerOS Security Update for kernel (EulerOS-SA-2021-2272)
  • 670543 EulerOS Security Update for kernel (EulerOS-SA-2021-2301)
  • 670578 EulerOS Security Update for kernel (EulerOS-SA-2021-2336)
  • 670634 EulerOS Security Update for kernel (EulerOS-SA-2021-2392)
  • 671047 EulerOS Security Update for kernel (EulerOS-SA-2021-2588)
  • 751336 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1460-1)
  • 751342 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3641-1)
  • 751346 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3655-1)
  • 751349 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1477-1)
  • 751353 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3675-1)
  • 751381 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3748-1)
  • 751437 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3876-1)
  • 751441 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3876-1)
  • 751451 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3935-1)
  • 751473 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:3969-1)
  • 900096 CBL-Mariner Linux Security Update for kernel 5.10.52.1
  • 900304 CBL-Mariner Linux Security Update for kernel 5.10.57.1
  • 900319 CBL-Mariner Linux Security Update for kernel 5.10.60.1
  • 901876 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (6561-1)
  • 902912 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4203)
  • 906180 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (4203-1)
  • 940265 AlmaLinux Security Update for kernel (ALSA-2021:4356)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report