Description
In 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.
Published: 2021-08-07
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No solution or workaround provided in the CVE record.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories
Source ID Title
Debian DSA Debian DSA DSA-4978-1 linux security update
EUVD EUVD EUVD-2021-24636 In 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.
Ubuntu USN Ubuntu USN USN-5096-1 Linux kernel (OEM) vulnerabilities
Ubuntu USN Ubuntu USN USN-5113-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-5115-1 Linux kernel (OEM) vulnerabilities
History

Thu, 08 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sat, 12 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00016}

epss

{'score': 0.0008}


Subscriptions

Debian Debian Linux
Fedoraproject Fedora
Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-10-08T21:03:29.217Z

Reserved: 2021-08-07T00:00:00.000Z

Link: CVE-2021-38166

cve-icon Vulnrichment

Updated: 2024-08-04T01:37:16.166Z

cve-icon NVD

Status : Analyzed

Published: 2021-08-07T18:15:07.043

Modified: 2026-10-08T21:17:38.970

Link: CVE-2021-38166

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-08-07T00:00:00Z

Links: CVE-2021-38166 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses