CVE-2021-47193

Service interruption via unreleased driver DMA buffers

Published Apr 10, 2024 · Updated May 11, 2026

Memory leak in the Linux pm80xx SCSI driver in 5.10 through 5.15.4 allows local users with module-unload privileges to exhaust memory. The pm8001_pci_remove function omits dma_free_coherent calls for each CCB PRD buffer and fails to free the CCB and device arrays after detaching the adapter. Repeated load-and-remove cycles require CAP_SYS_MODULE and compatible SAS or SATA adapter hardware; leaked allocations deplete kernel memory and interrupt service.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory leak in the Linux pm80xx SCSI driver in 5.10 through 5.15.4 allows local users with module-unload privileges to exhaust memory. The pm8001_pci_remove function omits dma_free_coherent calls for each CCB PRD buffer and fails to free the CCB and device arrays after detaching the adapter. Repeated load-and-remove cycles require CAP_SYS_MODULE and compatible SAS or SATA adapter hardware; leaked allocations deplete kernel memory and interrupt service.

The record

CVE
CVE-2021-47193
Published
Apr 10, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 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=5.10
  2. Affected versionversion=5a141315ed7c2647fa4518570c4941a02588b466 <0c4398f2ee030d5753f6b0ad83f0ed9077851d9a
  3. Affected versionversion=5a141315ed7c2647fa4518570c4941a02588b466 <269a4311b15f68d24e816f43f123888f241ed13d
  4. Affected versionversion=5a141315ed7c2647fa4518570c4941a02588b466 <51e6ed83bb4ade7c360551fa4ae55c4eacea354b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=5a141315ed7c2647fa4518570c4941a02588b466 <0c4398f2ee030d5753f6b0ad83f0ed9077851d9a; version=5a141315ed7c2647fa4518570c4941a02588b466 <269a4311b15f68d24e816f43f123888f241ed13d; version=5a141315ed7c2647fa4518570c4941a02588b466 <51e6ed83bb4ade7c360551fa4ae55c4eacea354b

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.

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
Privilegesauthenticated
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo