CVE-2021-47432

Local system crash via radix-tree offset overflow

Published May 21, 2024 · Updated May 11, 2026

Integer overflow in Linux's generic radix-tree iterator allows local users to crash the system through very large inode numbers. The __genradix_iter_peek path advances and rounds size_t byte offsets without detecting wraparound, so traversal can restart at an invalid position. Reaching the flaw requires low-privileged local access and traversal at offsets derived from large inode values; the published impact is limited to a kernel crash and service interruption.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux's generic radix-tree iterator allows local users to crash the system through very large inode numbers. The __genradix_iter_peek path advances and rounds size_t byte offsets without detecting wraparound, so traversal can restart at an invalid position. Reaching the flaw requires low-privileged local access and traversal at offsets derived from large inode values; the published impact is limited to a kernel crash and service interruption.

The record

CVE
CVE-2021-47432
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.1
  2. Affected versionversion=ba20ba2e3743bac786dff777954c11930256075e <784d01f9bbc282abb0c5ade5beb98a87f50343ac
  3. Affected versionversion=ba20ba2e3743bac786dff777954c11930256075e <9492261ff2460252cf2d8de89cdf854c7e2b28a0
  4. Affected versionversion=ba20ba2e3743bac786dff777954c11930256075e <aa7f1827953100cdde0795289a80c6c077bfe437
  5. Affected versionversion=ba20ba2e3743bac786dff777954c11930256075e <ec298b958cb0c40d70c68079da933c8f31c5134c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=ba20ba2e3743bac786dff777954c11930256075e <784d01f9bbc282abb0c5ade5beb98a87f50343ac; version=ba20ba2e3743bac786dff777954c11930256075e <9492261ff2460252cf2d8de89cdf854c7e2b28a0; version=ba20ba2e3743bac786dff777954c11930256075e <aa7f1827953100cdde0795289a80c6c077bfe437; version=ba20ba2e3743bac786dff777954c11930256075e <ec298b958cb0c40d70c68079da933c8f31c5134c

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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