CVE-2021-47030

Local denial of service via leaked coredump packet

Published Feb 28, 2024 · Updated May 11, 2026

Memory leak in the Linux kernel mt76 driver 5.12 through 5.12.3 allows local users to exhaust memory through mt7615 firmware coredumps. When mt7615_coredump_work dequeues a coredump packet that exceeds the remaining dump buffer, it exits the loop without releasing that packet. Exploitation requires local low-privileged access and compatible MediaTek MT7615 hardware; repeated coredumps can consume kernel memory and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel mt76 driver 5.12 through 5.12.3 allows local users to exhaust memory through mt7615 firmware coredumps. When mt7615_coredump_work dequeues a coredump packet that exceeds the remaining dump buffer, it exits the loop without releasing that packet. Exploitation requires local low-privileged access and compatible MediaTek MT7615 hardware; repeated coredumps can consume kernel memory and interrupt service.

The record

CVE
CVE-2021-47030
Published
Feb 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.12
  2. Affected versionversion=d2bf7959d9c0f631ef860edaf834d55773fdedff <49cc85059a2cb656f96ff3693f891e8fe8f669a9
  3. Affected versionversion=d2bf7959d9c0f631ef860edaf834d55773fdedff <54b989653c5531bc4416ced33f146b9cb633d978

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=d2bf7959d9c0f631ef860edaf834d55773fdedff <49cc85059a2cb656f96ff3693f891e8fe8f669a9; version=d2bf7959d9c0f631ef860edaf834d55773fdedff <54b989653c5531bc4416ced33f146b9cb633d978

Published CVSS scores

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

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-401Missing Release of Memory after Effective Lifetime
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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