CVE-2021-38166

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-38166
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-08-07 18:15:07 UTC
Updated2026-08-05 18:26:47 UTC
DescriptionIn kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without the CAP_SYS_ADMIN capability.

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-190 | CWE-787 | 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
CVE-2021-38166 Linux Kernel Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Debian -- Security Information -- DSA-4978-1 linux af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
kernel/git/bpf/bpf.git - BPF kernel tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch, Vendor Advisory
[SECURITY] Fedora 34 Update: kernel-5.13.10-200.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Third Party Advisory
[PATCH v2] bpf: Fix integer overflow involving bucket_size - Tatsuhiko Yasumatsu af854a3a-2127-422b-91ae-364da2661108 lore.kernel.org Patch
[SECURITY] Fedora 33 Update: kernel-5.13.10-100.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Third Party Advisory
[SECURITY] Fedora 33 Update: kernel-5.13.10-100.fc33 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
FEDORA:FEDORA-2021-f35f45a76f MITRE lists.fedoraproject.org
[PATCH v2] bpf: Fix integer overflow involving bucket_size - Tatsuhiko Yasumatsu MITRE lore.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 178809 Debian Security Update for linux (DSA 4978-1)
  • 184775 Debian Security Update for linux (CVE-2021-38166)
  • 198524 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5096-1)
  • 198540 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5113-1)
  • 198542 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5115-1)
  • 281818 Fedora Security Update for kernel (FEDORA-2021-f35f45a76f)
  • 281819 Fedora Security Update for kernel (FEDORA-2021-b22606e88b)
  • 353155 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.10-2022-005
  • 610372 Google Pixel Android October 2021 Security Patch Missing
  • 6140332 AWS Bottlerocket Security Update for kernel (GHSA-mjfv-5x2p-6cp6)
  • 751160 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3179-1)
  • 751170 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3205-1)
  • 900294 CBL-Mariner Linux Security Update for kernel 5.10.52.1
  • 900302 CBL-Mariner Linux Security Update for kernel 5.10.57.1
  • 900319 CBL-Mariner Linux Security Update for kernel 5.10.60.1
  • 900961 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (6581-1)
  • 903042 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (5156)
  • 906140 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (5156-1)

© 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