CVE-2021-47612

Kernel crash via NFC iterator null dereference

Published Jun 19, 2024 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel NFC subsystem from 3.1 allows local users to crash the kernel during device enumeration. After nfc_genl_dump_devices fails to allocate iterator state, nfc_genl_dump_devices_done passes a null iterator to class_dev_iter_exit, which dereferences it. A local low-privileged user must induce allocation failure during an NFC generic-netlink device dump; the bounded impact is a kernel crash and service interruption.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel NFC subsystem from 3.1 allows local users to crash the kernel during device enumeration. After nfc_genl_dump_devices fails to allocate iterator state, nfc_genl_dump_devices_done passes a null iterator to class_dev_iter_exit, which dereferences it. A local low-privileged user must induce allocation failure during an NFC generic-netlink device dump; the bounded impact is a kernel crash and service interruption.

The record

CVE
CVE-2021-47612
Published
Jun 19, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 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=3.1
  2. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <214af18abbe39db05beb305b2d11e87d09a6529c
  3. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <2a8845b9603c545fddd17862282dc4c4ce0971e3
  4. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <6644989642844de830f9b072cd65c553cb55946c
  5. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <c602863ad28ec86794cb4ab4edea5324f555f181
  6. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <d731ecc6f2eaec68f4ad1542283bbc7d07bd0112
  7. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <d89e4211b51752daf063d638af50abed2fd5f96d
  8. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <ea55b3797878752aa076b118afb727dcf79cac34
  9. Affected versionversion=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <fd79a0cbf0b2e34bcc45b13acf962e2032a82203

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.1; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <214af18abbe39db05beb305b2d11e87d09a6529c; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <2a8845b9603c545fddd17862282dc4c4ce0971e3; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <6644989642844de830f9b072cd65c553cb55946c; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <c602863ad28ec86794cb4ab4edea5324f555f181; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <d731ecc6f2eaec68f4ad1542283bbc7d07bd0112; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <d89e4211b51752daf063d638af50abed2fd5f96d; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <ea55b3797878752aa076b118afb727dcf79cac34; version=4d12b8b129f170d0fc3188de1e51a2a1b0f87730 <fd79a0cbf0b2e34bcc45b13acf962e2032a82203

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 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-476NULL Pointer Dereference
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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