CVE-2026-89848
HighCVSS 8.1Summary
In the Linux kernel, the scsi: qla2xxx driver's qla2xxx_delete_qpair() deleted the request queue before the response queue, leaving a window where the response MSI-X interrupt could dereference the freed rsp->req. This results in a use-after-free.
Risk Assessment
Can cause kernel memory corruption, system crashes, or potential privilege escalation via use-after-free.
Recommendation
Update the Linux kernel to a version containing the fix that releases the response-queue interrupt and flushes qpair->q_work before deleting the request queue.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Quiesce response IRQ before freeing request queue qla2xxx_delete_qpair() deletes the request queue before the response queue. qla25xx_delete_req_que() frees the request queue memory (kfree(req) in qla25xx_free_req_que()), but the response-queue MSI-X is only released later, in qla25xx_free_rsp_que(). In that window the response interrupt can still fire, qla2xxx_msix_rsp_q() queues qpair->q_work, and qla_do_work() -> qla24xx_process_response_queue() dereferences the now-freed rsp->req (LOGINOUT/CT/ELS entries and the status path), a use-after-free. The cancel_work_sync() added for the qpair teardown lives in the response free path, which runs after the request queue is already freed, so it does not protect rsp->req. Release the response-queue interrupt and flush qpair->q_work before deleting the request queue, so no late completion can reach the freed request queue. Clearing have_irq makes the subsequent qla25xx_free_rsp_que() skip its free_irq(), and the firmware queue-delete order (request then response) is preserved; the request-delete mailbox completes on the default vector and is unaffected by dropping the qpair response interrupt early.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS