CVE-2021-47051

Local service interruption via PM reference leak

Published Feb 28, 2024 · Updated May 11, 2026

Resource leak in the Linux kernel allows local users to interrupt service through failed LPSPI runtime power-management resumes. In drivers/spi/spi-fsl-lpspi.c, lpspi_prepare_xfer_hardware() calls pm_runtime_get_sync(), which increments the PM usage counter when resume fails, but the error path does not release that reference. Reachability requires local low-privileged access, an active Freescale LPSPI controller, and a failed runtime resume; repeated failures exhaust resources without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux kernel allows local users to interrupt service through failed LPSPI runtime power-management resumes. In drivers/spi/spi-fsl-lpspi.c, lpspi_prepare_xfer_hardware() calls pm_runtime_get_sync(), which increments the PM usage counter when resume fails, but the error path does not release that reference. Reachability requires local low-privileged access, an active Freescale LPSPI controller, and a failed runtime resume; repeated failures exhaust resources without reported data disclosure or modification.

The record

CVE
CVE-2021-47051
Published
Feb 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 28, 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

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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=5.2
  2. Affected versionversion=944c01a889d97dc08e1b71f4ed868f4023fd6034 <4a01ad002d2e03c399af536562693752af7c81b1
  3. Affected versionversion=944c01a889d97dc08e1b71f4ed868f4023fd6034 <6a2b5cee0d31ab6cc51030c441135b0e31217282
  4. Affected versionversion=944c01a889d97dc08e1b71f4ed868f4023fd6034 <a03675497970a93fcf25d81d9d92a59c2d7377a7
  5. Affected versionversion=944c01a889d97dc08e1b71f4ed868f4023fd6034 <b8207bfc539cd07d15e753ff2d179c5b61c673b1
  6. Affected versionversion=944c01a889d97dc08e1b71f4ed868f4023fd6034 <ce02e58ddf8658a4c3bed2296f32a5873b3f7cce

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=944c01a889d97dc08e1b71f4ed868f4023fd6034 <4a01ad002d2e03c399af536562693752af7c81b1; version=944c01a889d97dc08e1b71f4ed868f4023fd6034 <6a2b5cee0d31ab6cc51030c441135b0e31217282; version=944c01a889d97dc08e1b71f4ed868f4023fd6034 <a03675497970a93fcf25d81d9d92a59c2d7377a7; version=944c01a889d97dc08e1b71f4ed868f4023fd6034 <b8207bfc539cd07d15e753ff2d179c5b61c673b1; version=944c01a889d97dc08e1b71f4ed868f4023fd6034 <ce02e58ddf8658a4c3bed2296f32a5873b3f7cce

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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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