CVE-2026-64003
Received Received - Intake

SCSI Device Queue Hang in Linux Kernel

Publication date: 2026-07-19

Last updated on: 2026-07-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: scsi: core: Run queues for all non-SDEV_DEL devices from scsi_run_host_queues While a SCSI host is in a recovery state, scsi_mq_requeue_cmd() will not set the requeue list for a requeued command to be kicked in the future. The expectation is a call to scsi_run_host_queues() will kick all SCSI devices once the recovery state is cleared. However, scsi_run_host_queues() uses shost_for_each_device() which uses scsi_device_get() and so will ignore devices in a partially removed state like SDEV_CANCEL. But these devices may also have requeued requests, leaving their requests stuck from not being kicked and causing the removal process of the device to hang. scsi_run_host_queues() needs to run against more devices than the macro shost_for_each_device() allows. Instead of using the too limiting scsi_device_get() state checks, only ignore devices in SDEV_DEL state or when unable to acquire a reference. Attempt to run the queues for all other devices when scsi_run_host_queues() is called.

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Meta Information

Published
2026-07-19
Last Modified
2026-07-19
Generated
2026-07-20
AI Q&A
2026-07-19
EPSS Evaluated
N/A
NVD
CVE-2026-64003
EUVD
EUVD-2026-45576

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability where SCSI devices in a partially removed state (like SDEV_CANCEL) may have requeued requests stuck because scsi_run_host_queues() does not process them. The function uses shost_for_each_device() which skips such devices, causing the removal process to hang.

Detection Guidance

This vulnerability is specific to the Linux kernel's SCSI subsystem and may not have direct network detection methods. Monitor system logs for SCSI device removal hangs or requeued command issues. Check kernel messages with 'dmesg | grep -i scsi' or 'journalctl -k | grep -i scsi' for errors related to device recovery or queue stalls.

Impact Analysis

This vulnerability can cause system hangs during SCSI device removal, leading to potential system instability or crashes. It may disrupt storage operations and require a reboot to recover.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a Linux kernel SCSI subsystem issue causing device removal hangs due to improper request requeuing during recovery states. Compliance impacts would only occur if this vulnerability led to data processing disruptions or unavailability of critical systems handling sensitive data.

Mitigation Strategies

Apply the latest Linux kernel patches from your distribution to resolve this issue. If immediate patching is not possible, avoid initiating SCSI device removal operations during active I/O operations. Monitor system performance and SCSI device states for hangs or delays.

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