CVE-2026-31468

Local kernel corruption via dma-buf double free

Published Apr 22, 2026 · Updated Apr 22, 2026

Double free in Linux Kernel 6.19 through 6.19.10 allows local users to corrupt kernel memory via the VFIO PCI dma-buf feature. The vfio_pci_core_feature_dma_buf() error path falls through its full unwind chain and calls dma_buf_put() without a successful dma_buf_export(), unbalancing the VFIO device reference count and freeing allocated objects twice. The trigger requires local low-privileged access and file-descriptor exhaustion; published sources establish kernel memory corruption but no reliable post-corruption outcome.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in Linux Kernel 6.19 through 6.19.10 allows local users to corrupt kernel memory via the VFIO PCI dma-buf feature. The vfio_pci_core_feature_dma_buf() error path falls through its full unwind chain and calls dma_buf_put() without a successful dma_buf_export(), unbalancing the VFIO device reference count and freeing allocated objects twice. The trigger requires local low-privileged access and file-descriptor exhaustion; published sources establish kernel memory corruption but no reliable post-corruption outcome.

The record

CVE
CVE-2026-31468
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-415
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=5d74781ebc86c5fa9e9d6934024c505412de9b52 <83ad334afc9a645cef1062f5346526b1e36d6516
  2. Affected versionversion=5d74781ebc86c5fa9e9d6934024c505412de9b52 <e98137f0a874ab36d0946de4707aa48cb7137d1c
  3. Affected versionversion=6.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5d74781ebc86c5fa9e9d6934024c505412de9b52 <83ad334afc9a645cef1062f5346526b1e36d6516; version=5d74781ebc86c5fa9e9d6934024c505412de9b52 <e98137f0a874ab36d0946de4707aa48cb7137d1c; version=6.19

Published CVSS scores

7.8LinuxCVSS: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

CWE-415Double Free

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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