CVE-2021-47558

Kernel panic via active Tx queues during reconfiguration

Published May 24, 2024 · Updated May 11, 2026

A denial of service in Linux 5.10 allows local users to trigger a kernel panic by reconfiguring an active stmmac interface. The stmmac stop path leaves transmit queues enabled while it tears down and rebuilds interface resources, allowing concurrent transmission to access invalid state. Exploitation requires an active stmmac interface and network-administration privileges; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A denial of service in Linux 5.10 allows local users to trigger a kernel panic by reconfiguring an active stmmac interface. The stmmac stop path leaves transmit queues enabled while it tears down and rebuilds interface resources, allowing concurrent transmission to access invalid state. Exploitation requires an active stmmac interface and network-administration privileges; the bounded consequence is a kernel crash.

The record

CVE
CVE-2021-47558
Published
May 24, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 24, 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=0366f7e06a6bee7eace3946a6b67fb88b828bc5c <a92f0eebb8dc008b9e8c51c6f7b8c93b27a29a43
  2. Affected versionversion=0366f7e06a6bee7eace3946a6b67fb88b828bc5c <b270bfe697367776eca2e6759a71d700fb8d82a2
  3. Affected versionversion=5.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=0366f7e06a6bee7eace3946a6b67fb88b828bc5c <a92f0eebb8dc008b9e8c51c6f7b8c93b27a29a43; version=0366f7e06a6bee7eace3946a6b67fb88b828bc5c <b270bfe697367776eca2e6759a71d700fb8d82a2; version=5.10

Published CVSS scores

5.5OSVCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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