CVE-2024-56668

Kernel crash via unallocated nested-domain qi_batch

Published Dec 27, 2024 · Updated May 11, 2026

NULL pointer dereference in Linux 6.12 allows local users to crash the kernel when mapping pages to a nested Intel VT-d parent domain. The nested-parent assignment path skips qi_batch allocation, so cache_tag_flush_range_np dereferences a NULL batch pointer during IOMMU page mapping. Low-privileged local access to the iommufd mapping ioctl and a nested Intel VT-d parent domain are required; triggering the flaw produces a kernel oops and service interruption.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux 6.12 allows local users to crash the kernel when mapping pages to a nested Intel VT-d parent domain. The nested-parent assignment path skips qi_batch allocation, so cache_tag_flush_range_np dereferences a NULL batch pointer during IOMMU page mapping. Low-privileged local access to the iommufd mapping ioctl and a nested Intel VT-d parent domain are required; triggering the flaw produces a kernel oops and service interruption.

The record

CVE
CVE-2024-56668
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 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=6.12
  2. Affected versionversion=705c1cdf1e73c4c727bbfc8775434e6dd36e8baf <74536f91962d5f6af0a42414773ce61e653c10ee
  3. Affected versionversion=705c1cdf1e73c4c727bbfc8775434e6dd36e8baf <ffd774c34774fd4cc0e9cf2976595623a6c3a077

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=705c1cdf1e73c4c727bbfc8775434e6dd36e8baf <74536f91962d5f6af0a42414773ce61e653c10ee; version=705c1cdf1e73c4c727bbfc8775434e6dd36e8baf <ffd774c34774fd4cc0e9cf2976595623a6c3a077

Published CVSS scores

5.5CISA-ADPCVSS: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

CWE-476NULL Pointer Dereference
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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