CVE-2026-64472

Local service interrupt via shared bitfield races

Published Jul 25, 2026 · Updated Jul 25, 2026

Race condition in Linux Kernel 5.19 through 7.2-rc1 allows local users to cause a vfio/mlx5 service interrupt during device migration. Runtime flags sharing a bitfield storage unit undergo non-atomic read-modify-write operations, so concurrent detach, dirty-tracking, reset, error, or event updates can overwrite one another. Reachability requires an mlx5 VFIO device and local access to migration-related operations; the published assessment limits the reported consequence to availability loss.

CVSS severity4.7
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

Race condition in Linux Kernel 5.19 through 7.2-rc1 allows local users to cause a vfio/mlx5 service interrupt during device migration. Runtime flags sharing a bitfield storage unit undergo non-atomic read-modify-write operations, so concurrent detach, dirty-tracking, reset, error, or event updates can overwrite one another. Reachability requires an mlx5 VFIO device and local access to migration-related operations; the published assessment limits the reported consequence to availability loss.

The record

CVE
CVE-2026-64472
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

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=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <1dd99b8f4e143592e12e5a77e7b538bc698116cb
  3. Affected versionversion=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <399d806f998f7a25405fc1b97227e579aead24af
  4. Affected versionversion=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <39d163627b51886492bf31f66cb02c94613d2287
  5. Affected versionversion=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <7ed120b1a007bace57c461805519d70e1af44e59
  6. Affected versionversion=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f1db80a67da928a92ba460ede1be52d8941f46be
  7. Affected versionversion=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f2365a63b02ddea32e7db78b742c2503ec7b81f1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.19; version=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <1dd99b8f4e143592e12e5a77e7b538bc698116cb; version=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <399d806f998f7a25405fc1b97227e579aead24af; version=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <39d163627b51886492bf31f66cb02c94613d2287; version=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <7ed120b1a007bace57c461805519d70e1af44e59; version=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f1db80a67da928a92ba460ede1be52d8941f46be; version=61a2f1460fd03285ea34c1a235f2f50f71e13a1f <f2365a63b02ddea32e7db78b742c2503ec7b81f1

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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

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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