CVE-2021-47219

Kernel-memory disclosure and crash via signed length underflow

Published Apr 10, 2024 · Updated Aug 5, 2026

Out-of-bounds read in the Linux scsi_debug driver allows local users to disclose kernel memory or crash the system via a crafted SCSI command. resp_report_tgtpgs stores the command-derived allocation length in a signed integer, so a large value becomes negative before fill_from_dev_buffer copies the response. Exploitation requires local access and a loaded scsi_debug device reachable through the SCSI generic write interface; confidentiality and availability are affected, not integrity.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in the Linux scsi_debug driver allows local users to disclose kernel memory or crash the system via a crafted SCSI command. resp_report_tgtpgs stores the command-derived allocation length in a signed integer, so a large value becomes negative before fill_from_dev_buffer copies the response. Exploitation requires local access and a loaded scsi_debug device reachable through the SCSI generic write interface; confidentiality and availability are affected, not integrity.

The record

CVE
CVE-2021-47219
Published
Apr 10, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.6.19
  2. Affected versionversion=5a09e39810ae0465016c380962e12dd115779b87 <66523553fa62c7878fc5441dc4e82be71934eb77
  3. Affected versionversion=5a09e39810ae0465016c380962e12dd115779b87 <8440377e1a5644779b4c8d013aa2a917f5fc83c3
  4. Affected versionversion=5a09e39810ae0465016c380962e12dd115779b87 <f347c26836c270199de1599c3cd466bb7747caa9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.19; version=5a09e39810ae0465016c380962e12dd115779b87 <66523553fa62c7878fc5441dc4e82be71934eb77; version=5a09e39810ae0465016c380962e12dd115779b87 <8440377e1a5644779b4c8d013aa2a917f5fc83c3; version=5a09e39810ae0465016c380962e12dd115779b87 <f347c26836c270199de1599c3cd466bb7747caa9

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-125Out-of-bounds Read

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo