CVE-2021-47019

Kernel panic via unsynchronized suspend IRQ tasklet

Published Feb 28, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel 5.12 through 5.12.3 allows local users to trigger a kernel panic during system suspend. The mt7921 PCI suspend path leaves interrupts enabled and fails to synchronize pending IRQ handlers, allowing mt7921_irq_tasklet to access registers after the host PCIe controller is suspended. Reachability requires an MT7921E PCIe wireless device and local access to a system entering suspend; the bounded consequence is a host crash.

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

Denial of service in the Linux kernel 5.12 through 5.12.3 allows local users to trigger a kernel panic during system suspend. The mt7921 PCI suspend path leaves interrupts enabled and fails to synchronize pending IRQ handlers, allowing mt7921_irq_tasklet to access registers after the host PCIe controller is suspended. Reachability requires an MT7921E PCIe wireless device and local access to a system entering suspend; the bounded consequence is a host crash.

The record

CVE
CVE-2021-47019
Published
Feb 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
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=ffa1bf97425bd511b105ce769976e20a845a71e9 <b13cbc536990ff609afa878b6211cd6f6265ba60
  3. Affected versionversion=ffa1bf97425bd511b105ce769976e20a845a71e9 <fe3fccde8870764ba3e60610774bd7bc9f8faeff

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=ffa1bf97425bd511b105ce769976e20a845a71e9 <b13cbc536990ff609afa878b6211cd6f6265ba60; version=ffa1bf97425bd511b105ce769976e20a845a71e9 <fe3fccde8870764ba3e60610774bd7bc9f8faeff

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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