CVE-2021-47003

Kernel crash via unchecked null status write

Published Feb 28, 2024 · Updated May 23, 2026

NULL pointer dereference in the Linux IDXD dmaengine driver allows local users to crash affected kernels through device commands. The idxd_cmd_exec function writes a device-error value through its status argument before checking whether callers supplied a null pointer. Reachability requires the affected IDXD driver path, and the documented consequence is a local kernel crash without data disclosure or modification.

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 IDXD dmaengine driver allows local users to crash affected kernels through device commands. The idxd_cmd_exec function writes a device-error value through its status argument before checking whether callers supplied a null pointer. Reachability requires the affected IDXD driver path, and the documented consequence is a local kernel crash without data disclosure or modification.

The record

CVE
CVE-2021-47003
Published
Feb 28, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=40e3b5c128645d2ddad12310c7be98758cafb2b0 <5756f757c72501ef1a16f5f63f940623044180e9
  2. Affected versionversion=5.10.17 <5.10.38
  3. Affected versionversion=5.11
  4. Affected versionversion=89e3becd8f821e507052e012d2559dcda59f538e <2280b4cc29d8cdd2be3d1b2d1ea4f958e2131c97
  5. Affected versionversion=89e3becd8f821e507052e012d2559dcda59f538e <28ac8e03c43dfc6a703aa420d18222540b801120
  6. Affected versionversion=89e3becd8f821e507052e012d2559dcda59f538e <7bc402f843e7817a4a808e7b9ab0bcd7ffd55bfa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=40e3b5c128645d2ddad12310c7be98758cafb2b0 <5756f757c72501ef1a16f5f63f940623044180e9; version=5.10.17 <5.10.38; version=5.11; version=89e3becd8f821e507052e012d2559dcda59f538e <2280b4cc29d8cdd2be3d1b2d1ea4f958e2131c97; version=89e3becd8f821e507052e012d2559dcda59f538e <28ac8e03c43dfc6a703aa420d18222540b801120; version=89e3becd8f821e507052e012d2559dcda59f538e <7bc402f843e7817a4a808e7b9ab0bcd7ffd55bfa

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 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
T1499Endpoint Denial of Service

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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