Linux Kernel up to 6.12.95/6.18.38/7.1.3/7.2-rc1 VFIO vfio_unregister_group_dev race condition

CVSS Meta Temp Score
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CTI Interest Score
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8.7$0-$5k2.33-

Summaryinfo

A vulnerability described as very critical has been identified in Linux Kernel up to 6.12.95/6.18.38/7.1.3/7.2-rc1. Affected by this vulnerability is the function vfio_unregister_group_dev of the component VFIO. The manipulation results in race condition. This vulnerability is reported as CVE-2026-64473. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.95/6.18.38/7.1.3/7.2-rc1. It has been classified as very critical. Affected is the function vfio_unregister_group_dev of the component VFIO. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: vfio: Remove device debugfs before releasing devres VFIO device debugfs files created with debugfs_create_devm_seqfile() store a devres allocated debugfs_devm_entry as inode private data. vfio_unregister_group_dev() currently calls vfio_device_del() before vfio_device_debugfs_exit(), but device_del() releases devres. This can leave debugfs entries visible with stale inode private data while unregister waits for userspace references to drain. Remove the per-device debugfs tree before vfio_device_del(). The debugfs view is diagnostic only, so losing it at the start of unregister is preferable to preserving entries whose backing storage may already have been released. Complete the teardown by clearing the per-device debugfs root after removal. This matches the global debugfs root cleanup and prevents future users from mistaking a removed dentry for a live debugfs tree during the remainder of unregister.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-64473 since 07/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 6.12.96, 6.18.39, 7.1.4 or 7.2-rc2 eliminates this vulnerability. Applying the patch 6cc60b41d61657dc469893d14e8e55d160056ff1/a53109ffb6b5148e11a27fb7670355b92db12dd3/a5df401dc84f091e20b045560569f0736758fea7/dc7fe87de492ea7f33a72b78d26650b75bf37f4f is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.96/6.18.39/7.1.4/7.2-rc2
Patch: 6cc60b41d61657dc469893d14e8e55d160056ff1/a53109ffb6b5148e11a27fb7670355b92db12dd3/a5df401dc84f091e20b045560569f0736758fea7/dc7fe87de492ea7f33a72b78d26650b75bf37f4f

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64473 (🔒)
GCVE (CVE): GCVE-0-2026-64473
GCVE (VulDB): GCVE-100-383262

Entryinfo

Created: 07/25/2026 19:00
Changes: 07/25/2026 19:00 (59)
Complete: 🔍
Cache ID: 216::103

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