CVE-2024-56756

Local service interruption via incorrect DMA free size

Published Dec 29, 2024 · Updated May 11, 2026

A memory deallocation error in the Linux kernel NVMe PCI driver allows local users to interrupt service during HMB allocation. The __nvme_alloc_host_mem path can stop after an allocation failure but passes the table's planned descriptor count, rather than the allocated count, to dma_free_coherent. Exploitation requires local reachability of NVMe host-memory-buffer setup and an allocation failure; ordinary low descriptor counts and page-granular coherent allocation usually mask the bad size.

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

A memory deallocation error in the Linux kernel NVMe PCI driver allows local users to interrupt service during HMB allocation. The __nvme_alloc_host_mem path can stop after an allocation failure but passes the table's planned descriptor count, rather than the allocated count, to dma_free_coherent. Exploitation requires local reachability of NVMe host-memory-buffer setup and an allocation failure; ordinary low descriptor counts and page-granular coherent allocation usually mask the bad size.

The record

CVE
CVE-2024-56756
Published
Dec 29, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 29, 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=4.13
  2. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <3c2fb1ca8086eb139b2a551358137525ae8e0d7a
  3. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <452f9ddd12bebc04cef741e8ba3806bf0e1fd015
  4. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <582d9ed999b004fb1d415ecbfa86d4d8df455269
  5. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <6d0f599db73b099aa724a12736369c4d4d92849d
  6. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <869cf50b9c9d1059f5223f79ef68fc0bc6210095
  7. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <ac22240540e0c5230d8c4138e3778420b712716a
  8. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <cee3bff51a35cab1c5d842d409a7b11caefe2386
  9. Affected versionversion=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <fb96d5cfa97a7363245b3dd523f475b04296d87b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <3c2fb1ca8086eb139b2a551358137525ae8e0d7a; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <452f9ddd12bebc04cef741e8ba3806bf0e1fd015; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <582d9ed999b004fb1d415ecbfa86d4d8df455269; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <6d0f599db73b099aa724a12736369c4d4d92849d; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <869cf50b9c9d1059f5223f79ef68fc0bc6210095; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <ac22240540e0c5230d8c4138e3778420b712716a; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <cee3bff51a35cab1c5d842d409a7b11caefe2386; version=87ad72a59a38d1df217cfd95bc222a2edfe5d399 <fb96d5cfa97a7363245b3dd523f475b04296d87b

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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