CVE-2026-64476

Device availability disruption via unbalanced runtime PM

Published Jul 25, 2026 · Updated Jul 25, 2026

Availability flaw in Linux Kernel allows local users with administrative privileges to disrupt VFIO PCI device power management. The vfio-pci driver retains disable_idle_d3 in module-global state, so module reloads can change its value for already-bound variant devices and unbalance refcounted runtime-PM get and put operations. Exploitation requires privileged local access to alter module state; the resulting impact is limited to reduced availability of affected VFIO PCI devices.

CVSS severity1.9
Low
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

Availability flaw in Linux Kernel allows local users with administrative privileges to disrupt VFIO PCI device power management. The vfio-pci driver retains disable_idle_d3 in module-global state, so module reloads can change its value for already-bound variant devices and unbalance refcounted runtime-PM get and put operations. Exploitation requires privileged local access to alter module state; the resulting impact is limited to reduced availability of affected VFIO PCI devices.

The record

CVE
CVE-2026-64476
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=5.19
  2. Affected versionversion=7ab5e10eda02da1d9562ffde562c51055d368e9c <062b820290bcb9778e43a73597df76e9bb08acfb
  3. Affected versionversion=7ab5e10eda02da1d9562ffde562c51055d368e9c <332d785f9ae426eeeb92527872adf09d84101ba3
  4. Affected versionversion=7ab5e10eda02da1d9562ffde562c51055d368e9c <4575e9aac5336d1365138c0284773bf8da4b1fa3
  5. Affected versionversion=7ab5e10eda02da1d9562ffde562c51055d368e9c <654710ef3135c4546b20a903bc23a51b0c44d6c8
  6. Affected versionversion=7ab5e10eda02da1d9562ffde562c51055d368e9c <b98296816d31441b307ef9fa8670dcf5a55e5505
  7. Affected versionversion=7ab5e10eda02da1d9562ffde562c51055d368e9c <f6c67cf0051f96ba61d186731d3d9409b9927db2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.19; version=7ab5e10eda02da1d9562ffde562c51055d368e9c <062b820290bcb9778e43a73597df76e9bb08acfb; version=7ab5e10eda02da1d9562ffde562c51055d368e9c <332d785f9ae426eeeb92527872adf09d84101ba3; version=7ab5e10eda02da1d9562ffde562c51055d368e9c <4575e9aac5336d1365138c0284773bf8da4b1fa3; version=7ab5e10eda02da1d9562ffde562c51055d368e9c <654710ef3135c4546b20a903bc23a51b0c44d6c8; version=7ab5e10eda02da1d9562ffde562c51055d368e9c <b98296816d31441b307ef9fa8670dcf5a55e5505; version=7ab5e10eda02da1d9562ffde562c51055d368e9c <f6c67cf0051f96ba61d186731d3d9409b9927db2

Published CVSS scores

1.9Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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