CVE-2021-46283

Local denial of service via nftables set creation

Published Jan 11, 2022 · Updated Aug 4, 2024

Denial-of-service vulnerability in Linux kernel before 5.12.13 allows local users to crash the kernel via crafted nftables set expressions. The nf_tables_newset path calls nft_set_elem_expr_alloc without initializing required state, leading to NULL-pointer dereference or general-protection faults. Exploitation requires local access and a user namespace able to configure netfilter tables; impact is service interruption without confidentiality or integrity loss.

CVSS severity5.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial-of-service vulnerability in Linux kernel before 5.12.13 allows local users to crash the kernel via crafted nftables set expressions. The nf_tables_newset path calls nft_set_elem_expr_alloc without initializing required state, leading to NULL-pointer dereference or general-protection faults. Exploitation requires local access and a user namespace able to configure netfilter tables; impact is service interruption without confidentiality or integrity loss.

The record

CVE
CVE-2021-46283
Published
Jan 11, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-665, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9NVDAV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-665Improper Initialization
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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