CVE-2021-47048

Kernel invalid memory access via freed buffer

Published Feb 28, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux ZynqMP GQSPI driver allows attackers to trigger invalid kernel memory access through SPI operations. The zynqmp_qspi_exec_op path frees tmpbuf before later reading address and opcode data from that buffer instead of preserving those values in temporary variables. The published record does not identify an attacker-controlled input, required privilege, or outcome beyond a KASAN-detected invalid access.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
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 ZynqMP GQSPI driver allows attackers to trigger invalid kernel memory access through SPI operations. The zynqmp_qspi_exec_op path frees tmpbuf before later reading address and opcode data from that buffer instead of preserving those values in temporary variables. The published record does not identify an attacker-controlled input, required privilege, or outcome beyond a KASAN-detected invalid access.

The record

CVE
CVE-2021-47048
Published
Feb 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 28, 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=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <1231279389b5e638bc3b66b9741c94077aed4b5a
  2. Affected versionversion=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <23269ac9f123eca3aea7682d3345c02e71ed696c
  3. Affected versionversion=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <a2c5bedb2d55dd27c642c7b9fb6886d7ad7bdb58
  4. Affected versionversion=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <d67e0d6bd92ebbb0294e7062bbf5cdc773764e62
  5. Affected versionversion=5.10

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <1231279389b5e638bc3b66b9741c94077aed4b5a; version=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <23269ac9f123eca3aea7682d3345c02e71ed696c; version=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <a2c5bedb2d55dd27c642c7b9fb6886d7ad7bdb58; version=1c26372e5aa9e53391a1f8fe0dc7cd93a7e5ba9e <d67e0d6bd92ebbb0294e7062bbf5cdc773764e62; version=5.10

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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