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CVE-2026-93242: scsi: qla2xxx: Fix response queue over-consumption in __qla_consume_iocb()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-19

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().

Affected products

• Linux kernel: 5.15 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/31715d1e1cbf3a37ce3452635c5602f73fd7abd4
• https://git.kernel.org/stable/c/3ba019bdd89d931499d9476456b5d9c7ab7fa753
• https://git.kernel.org/stable/c/6e3f129538c32d0019437197735912308c161843
• https://git.kernel.org/stable/c/a136c311676fd1010b1bde3bcfd410caa2fa040f
• https://git.kernel.org/stable/c/bd1534d4afab47f13dfc27fff6f59dd859a0ac3a
• https://git.kernel.org/stable/c/d841707fafba5f80341b82e8c3a4c24fc5aa5132
• https://git.kernel.org/stable/c/df86c27cf1ba9d66f737a1fa56479c6e7efafe4e

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