CVE-2021-47601

Kernel crash via unchecked allocation failure

Published Jun 19, 2024 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel AMD-TEE driver allows local users to crash the kernel during a Trusted Application load. In copy_ta_binary(), an IS_ERR check accepts the NULL result from __get_free_pages(), after which the copy path dereferences the failed allocation. Exploitation requires local access, AMD-TEE availability, a Trusted Application load, and an allocation failure; the bounded consequence is system unavailability.

CVSS severity5.5
Medium
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

NULL pointer dereference in the Linux kernel AMD-TEE driver allows local users to crash the kernel during a Trusted Application load. In copy_ta_binary(), an IS_ERR check accepts the NULL result from __get_free_pages(), after which the copy path dereferences the failed allocation. Exploitation requires local access, AMD-TEE availability, a Trusted Application load, and an allocation failure; the bounded consequence is system unavailability.

The record

CVE
CVE-2021-47601
Published
Jun 19, 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. 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.6
  2. Affected versionversion=757cc3e9ff1d72d014096399d6e2bf03974d9da1 <640e28d618e82be78fb43b4bf5113bc90d6aa442
  3. Affected versionversion=757cc3e9ff1d72d014096399d6e2bf03974d9da1 <832f3655c6138c23576ed268e31cc76e0f05f2b1
  4. Affected versionversion=757cc3e9ff1d72d014096399d6e2bf03974d9da1 <9d7482771fac8d8e38e763263f2ca0ca12dd22c6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=757cc3e9ff1d72d014096399d6e2bf03974d9da1 <640e28d618e82be78fb43b4bf5113bc90d6aa442; version=757cc3e9ff1d72d014096399d6e2bf03974d9da1 <832f3655c6138c23576ed268e31cc76e0f05f2b1; version=757cc3e9ff1d72d014096399d6e2bf03974d9da1 <9d7482771fac8d8e38e763263f2ca0ca12dd22c6

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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