CVE-2021-47198

Kernel crash via uncleared login flag

Published Apr 10, 2024 · Updated May 11, 2026

Use-after-free in the Linux lpfc SCSI driver in Linux 5.14 through 5.15.4 allows local users to crash the kernel during driver unload. The login-completion path leaves NLP_REG_LOGIN_SEND set, permitting a second lpfc_unreg_rpi call to use the freed nlp_rpi value as an rpi_ids index. Reachability requires the lpfc driver, a completed fabric-control-node login, and the subsequent RPI unregister sequence during unload.

CVSS severity7.8
High
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

Use-after-free in the Linux lpfc SCSI driver in Linux 5.14 through 5.15.4 allows local users to crash the kernel during driver unload. The login-completion path leaves NLP_REG_LOGIN_SEND set, permitting a second lpfc_unreg_rpi call to use the freed nlp_rpi value as an rpi_ids index. Reachability requires the lpfc driver, a completed fabric-control-node login, and the subsequent RPI unregister sequence during unload.

The record

CVE
CVE-2021-47198
Published
Apr 10, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 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=5.14
  2. Affected versionversion=fe83e3b9b422ac8ece2359c7b7290efe7f0335a2 <79b20beccea3a3938a8500acef4e6b9d7c66142f
  3. Affected versionversion=fe83e3b9b422ac8ece2359c7b7290efe7f0335a2 <dbebf865b3239595c1d4dba063b122862583b52a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=fe83e3b9b422ac8ece2359c7b7290efe7f0335a2 <79b20beccea3a3938a8500acef4e6b9d7c66142f; version=fe83e3b9b422ac8ece2359c7b7290efe7f0335a2 <dbebf865b3239595c1d4dba063b122862583b52a

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free

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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