CVE-2021-47282

System crash via oversized GPIO chip-select configuration

Published May 21, 2024 · Updated Aug 5, 2026

Out-of-bounds access in the Linux bcm2835 SPI driver allows local users to crash systems configured with more than three GPIO chip selects. Device-tree GPIO entries raise num_chipselect beyond three, after which the driver indexes the statically sized prepare_cs array with an expanded chip-select number. Reachability requires bcm2835 SPI hardware and a device tree declaring excess GPIO chip selects; the resulting kernel-memory corruption interrupts service.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux bcm2835 SPI driver allows local users to crash systems configured with more than three GPIO chip selects. Device-tree GPIO entries raise num_chipselect beyond three, after which the driver indexes the statically sized prepare_cs array with an expanded chip-select number. Reachability requires bcm2835 SPI hardware and a device tree declaring excess GPIO chip selects; the resulting kernel-memory corruption interrupts service.

The record

CVE
CVE-2021-47282
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.4
  2. Affected versionversion=571e31fa60b3697d5db26140e16d5c45c51c9815 <01415ff85a24308059e06ca3e97fd7bf75648690
  3. Affected versionversion=571e31fa60b3697d5db26140e16d5c45c51c9815 <13817d466eb8713a1ffd254f537402f091d48444
  4. Affected versionversion=571e31fa60b3697d5db26140e16d5c45c51c9815 <82a8ffba54d31e97582051cb56ba1f988018681e
  5. Affected versionversion=571e31fa60b3697d5db26140e16d5c45c51c9815 <b5502580cf958b094f3b69dfe4eece90eae01fbc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=571e31fa60b3697d5db26140e16d5c45c51c9815 <01415ff85a24308059e06ca3e97fd7bf75648690; version=571e31fa60b3697d5db26140e16d5c45c51c9815 <13817d466eb8713a1ffd254f537402f091d48444; version=571e31fa60b3697d5db26140e16d5c45c51c9815 <82a8ffba54d31e97582051cb56ba1f988018681e; version=571e31fa60b3697d5db26140e16d5c45c51c9815 <b5502580cf958b094f3b69dfe4eece90eae01fbc

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
T1499.004Application 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

See the directory against your own environment.

Your stack

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