CVE-2021-4441

Kernel crash via unchecked allocation result

Published Aug 22, 2024 · Updated May 11, 2026

NULL pointer dereference in the Linux Zynq QSPI driver allows local users to crash the kernel through a memory allocation failure. The zynq_qspi_exec_mem_op function passes the result of kzalloc directly to memset without first checking whether allocation returned NULL. Triggering the crash requires the Zynq QSPI driver and an allocation failure during a memory operation; the Linux CNA states that this static-analysis finding can be a false positive or hard to trigger.

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 Zynq QSPI driver allows local users to crash the kernel through a memory allocation failure. The zynq_qspi_exec_mem_op function passes the result of kzalloc directly to memset without first checking whether allocation returned NULL. Triggering the crash requires the Zynq QSPI driver and an allocation failure during a memory operation; the Linux CNA states that this static-analysis finding can be a false positive or hard to trigger.

The record

CVE
CVE-2021-4441
Published
Aug 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 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=5.2
  2. Affected versionversion=67dca5e580f1e93a66177389981541cac208c817 <2efece1368aeee2d2552c7ec36aeb676c4d4c95f
  3. Affected versionversion=67dca5e580f1e93a66177389981541cac208c817 <3c32405d6474a21f7d742828e73c13e326dcae82
  4. Affected versionversion=67dca5e580f1e93a66177389981541cac208c817 <ab3824427b848da10e9fe2727f035bbeecae6ff4
  5. Affected versionversion=67dca5e580f1e93a66177389981541cac208c817 <b9dd08cbebe0c593c49bf86d2012a431494e54cb
  6. Affected versionversion=67dca5e580f1e93a66177389981541cac208c817 <df14d2bed8e2455878e046e67123d9ecb2e79056

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=67dca5e580f1e93a66177389981541cac208c817 <2efece1368aeee2d2552c7ec36aeb676c4d4c95f; version=67dca5e580f1e93a66177389981541cac208c817 <3c32405d6474a21f7d742828e73c13e326dcae82; version=67dca5e580f1e93a66177389981541cac208c817 <ab3824427b848da10e9fe2727f035bbeecae6ff4; version=67dca5e580f1e93a66177389981541cac208c817 <b9dd08cbebe0c593c49bf86d2012a431494e54cb; version=67dca5e580f1e93a66177389981541cac208c817 <df14d2bed8e2455878e046e67123d9ecb2e79056

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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.

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-476NULL Pointer Dereference
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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