CVE-2024-56624

Kernel memory corruption via iommufd double release

Published Dec 27, 2024 · Updated Aug 5, 2026

A use-after-free in Linux 6.11 allows local users with iommufd or VFIO device access to read or write kernel memory or crash the kernel. The error path in iommufd_fault_alloc() calls fput(), whose release operation frees the fault object and context, and then decrements both references again. Access to /dev/iommu or /dev/vfio/vfio is required; triggering the path can cause kernel-memory disclosure, arbitrary writes, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in Linux 6.11 allows local users with iommufd or VFIO device access to read or write kernel memory or crash the kernel. The error path in iommufd_fault_alloc() calls fput(), whose release operation frees the fault object and context, and then decrements both references again. Access to /dev/iommu or /dev/vfio/vfio is required; triggering the path can cause kernel-memory disclosure, arbitrary writes, or a kernel panic.

The record

CVE
CVE-2024-56624
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=07838f7fd529c8a6de44b601d4b7057e6c8d36ed <2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d
  2. Affected versionversion=07838f7fd529c8a6de44b601d4b7057e6c8d36ed <af7f4780514f850322b2959032ecaa96e4b26472
  3. Affected versionversion=6.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=07838f7fd529c8a6de44b601d4b7057e6c8d36ed <2b3f30c8edbf9a122ce01f13f0f41fbca5f1d41d; version=07838f7fd529c8a6de44b601d4b7057e6c8d36ed <af7f4780514f850322b2959032ecaa96e4b26472; version=6.11

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1068Exploitation for Privilege Escalation

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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