CVE-2026-93242 scsi: qla2xxx: Fix response queue over-consumption in __qla_consume_iocb()
A logic error in the qla2xxx SCSI driver causes response queue over-consumption, leading to dropped firmware responses and potential denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93242?
CVE-2026-93242 is a denial of service vulnerability in Linux, published on 24 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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().
Which versions are affected by CVE-2026-93242?
How do I fix CVE-2026-93242?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-93242 being exploited?
There is no known exploitation of CVE-2026-93242 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93242, DEBIAN-CVE-2026-93242, GHSA-w8h6-pxw4-jqxh, UBUNTU-CVE-2026-93242.