CVE-2021-47315

Kernel resource consumption via leaked I/O mapping

Published May 21, 2024 · Updated May 11, 2026

Resource leak in the fsl_ifc memory driver in affected Linux kernels allows local users to consume an I/O mapping through a probe failure. On the fsl_ifc_ctrl_probe() error path, the driver returns without unmapping fsl_ifc_ctrl_dev->gregs after it was mapped. Reachability requires local low-privileged access and a failing Freescale Local Bus controller probe; published sources do not specify whether exhaustion ends in a hang or crash.

CVSS severity5.5
Medium
EPSS probability0.25%
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 fsl_ifc memory driver in affected Linux kernels allows local users to consume an I/O mapping through a probe failure. On the fsl_ifc_ctrl_probe() error path, the driver returns without unmapping fsl_ifc_ctrl_dev->gregs after it was mapped. Reachability requires local low-privileged access and a failing Freescale Local Bus controller probe; published sources do not specify whether exhaustion ends in a hang or crash.

The record

CVE
CVE-2021-47315
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=3.3
  2. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <28f71fd81ebd3b386bf5c7c5539664156f7d72c1
  3. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <3b132ab67fc7a358fff35e808fa65d4bea452521
  4. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <6b3b002de90738e3c85853a682ce7e0fa078d42b
  5. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <83af5816308b490b05fc8fa27fc1bdc769df200a
  6. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <8d071d270afba468708faca5f7b6d9e656f75e27
  7. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <94bc2fe46102d1e060fc749c0c19511e76c9995f
  8. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <d0d04b95e8ed0223844a1d58497c686fe2e4a955
  9. Affected versionversion=a20cbdeffce247a2b6fb83cd8d22433994068565 <d9213d4f372d30b5bc4d921795d6bed0c0e3eebf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.3; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <28f71fd81ebd3b386bf5c7c5539664156f7d72c1; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <3b132ab67fc7a358fff35e808fa65d4bea452521; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <6b3b002de90738e3c85853a682ce7e0fa078d42b; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <83af5816308b490b05fc8fa27fc1bdc769df200a; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <8d071d270afba468708faca5f7b6d9e656f75e27; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <94bc2fe46102d1e060fc749c0c19511e76c9995f; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <d0d04b95e8ed0223844a1d58497c686fe2e4a955; version=a20cbdeffce247a2b6fb83cd8d22433994068565 <d9213d4f372d30b5bc4d921795d6bed0c0e3eebf

Published CVSS scores

5.5CanonicalCVSS: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

No sourced classifications are available.

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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