CVE-2021-47427

Unspecified impact via abort-path task use-after-free

Published May 21, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel iSCSI abort path in 5.14 before 5.14.12 allows attackers to cause unspecified impact via unspecified vectors. The abort handler routes an already-completed iscsi_task through common cleanup, which drops another task reference after the task has become invalid. The record does not establish how attackers reach that abort case or whether the consequence is limited to a crash.

CVSS severityUnavailable
Unscored
EPSS probability0.46%
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 kernel iSCSI abort path in 5.14 before 5.14.12 allows attackers to cause unspecified impact via unspecified vectors. The abort handler routes an already-completed iscsi_task through common cleanup, which drops another task reference after the task has become invalid. The record does not establish how attackers reach that abort case or whether the consequence is limited to a crash.

The record

CVE
CVE-2021-47427
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 21, 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

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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=d39df158518ccc3bf24ee18082b5e100c8f014aa <1642f51ac0d4f2b55d5748094c49ff8f7191b93c
  3. Affected versionversion=d39df158518ccc3bf24ee18082b5e100c8f014aa <258aad75c62146453d03028a44f2f1590d58e1f6

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=d39df158518ccc3bf24ee18082b5e100c8f014aa <1642f51ac0d4f2b55d5748094c49ff8f7191b93c; version=d39df158518ccc3bf24ee18082b5e100c8f014aa <258aad75c62146453d03028a44f2f1590d58e1f6

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
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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