CVE-2026-93242
Received Received - Intake

Buffer Overflow in Linux Kernel QLogic SCSI Driver

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix response queue over-consumption in __qla_consume_iocb() qla24xx_process_response_queue() advances ring_ptr past the head IOCB before dispatching, so by the time __qla_consume_iocb() runs, ring_ptr already points at the first continuation IOCB. The function however looped purex->entry_count times starting at ring_ptr. As entry_count includes the head, this consumed one entry too many: it stamped RESPONSE_PROCESSED on the next, unrelated IOCB and advanced the ring past it, silently dropping a legitimate firmware response. The head IOCB's signature was also never marked. Mark the head processed and account for it, then consume only the entry_count - 1 continuation IOCBs, matching __qla_copy_purex_to_buffer().

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-93242
EUVD
EUVD-2026-86248

Affected Vendors & Products

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

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves incorrect handling of response queues in the qla2xxx SCSI driver. The function __qla_consume_iocb() incorrectly processes one extra entry in the response queue, causing it to skip a legitimate firmware response and potentially drop it silently. This happens because the function loops entry_count times starting from an already advanced ring pointer, consuming an unrelated IOCB.

Detection Guidance

This vulnerability is specific to the Linux kernel's qla2xxx SCSI driver and may not have direct detection commands. Monitor kernel logs for SCSI-related errors or warnings, particularly involving qla2xxx. Check for unexpected I/O failures or dropped firmware responses in system logs.

Impact Analysis

This vulnerability could lead to data corruption or loss if legitimate firmware responses are dropped. It may cause the SCSI driver to malfunction, potentially resulting in system instability, I/O errors, or unexpected behavior in storage operations.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. If immediate patching is not possible, consider disabling the qla2xxx driver if not in use or apply vendor-specific mitigations if available.

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