CVE-2021-22415Public exploit

Kernel crash via malformed NPU memory mapping

Published Aug 2, 2021 · Updated Aug 3, 2024

Use-after-free in Huawei EMUI 11.0.0's NPU kernel driver allows attackers to crash the kernel through a crafted memory mapping. The devdrv_info_sq_cq_mmap function maps 0x8100000 bytes regardless of the requested size and creates unmapped holes, corrupting virtual-memory structures or triggering invalid page access. Reaching /dev/davinci0 requires control of the SELinux-confined hiaiserver process; the demonstrated result is a kernel crash.

CVSS severity7.5
High
EPSS probability0.68%
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 Huawei EMUI 11.0.0's NPU kernel driver allows attackers to crash the kernel through a crafted memory mapping. The devdrv_info_sq_cq_mmap function maps 0x8100000 bytes regardless of the requested size and creates unmapped holes, corrupting virtual-memory structures or triggering invalid page access. Reaching /dev/davinci0 requires control of the SELinux-confined hiaiserver process; the demonstrated result is a kernel crash.

The record

CVE
CVE-2021-22415
Published
Aug 2, 2021
Updated
Aug 3, 2024
Vendor
MindSpore
Product
EMUI
Classifications
CWE-131, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=11.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

MindSpore · EMUIversion=11.0.0

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
T1499Endpoint Denial of Service

Public exploit references

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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