CVE-2021-47147

Availability loss via unreleased PCI BAR mappings

Published Mar 25, 2024 · Updated May 11, 2026

Resource leak in Linux kernel 5.11 through 5.12.8 and 5.13 release candidates allows local users to deplete mapped I/O resources. The ptp_ocp_probe error path returns after pci_ioremap_bar maps a PCI BAR without calling pci_iounmap, leaving the mapping allocated. Reachability requires OCP PTP PCI hardware and an error after mapping; published assessments limit the consequence to availability loss.

CVSS severity6.2
Medium
EPSS probability0.20%
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 Linux kernel 5.11 through 5.12.8 and 5.13 release candidates allows local users to deplete mapped I/O resources. The ptp_ocp_probe error path returns after pci_ioremap_bar maps a PCI BAR without calling pci_iounmap, leaving the mapping allocated. Reachability requires OCP PTP PCI hardware and an error after mapping; published assessments limit the consequence to availability loss.

The record

CVE
CVE-2021-47147
Published
Mar 25, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 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=5.11
  2. Affected versionversion=a7e1abad13f3f0366ee625831fecda2b603cdc17 <0e38e702f1152479e6afac34f151dbfd99417f99
  3. Affected versionversion=a7e1abad13f3f0366ee625831fecda2b603cdc17 <9c1bb37f8cad5e2ee1933fa1da9a6baa7876a8e4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=a7e1abad13f3f0366ee625831fecda2b603cdc17 <0e38e702f1152479e6afac34f151dbfd99417f99; version=a7e1abad13f3f0366ee625831fecda2b603cdc17 <9c1bb37f8cad5e2ee1933fa1da9a6baa7876a8e4

Published CVSS scores

6.2NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.2CISA-ADPCVSS:3.1/AV:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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

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Your stack

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