CVE-2026-89848scsi: qla2xxx: Quiesce response IRQ before freeing request queue

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/730a18768b27582636b5af343069c30809b763a2
• https://git.kernel.org/stable/c/be68aef64ab2e633867c4ac946d16644c306fc3d
• https://git.kernel.org/stable/c/0a005dcc5e9bf7b31a45422b10f2765b25161389
• https://git.kernel.org/stable/c/7ac5be2a8609679fc6bbfea881360444a5ce8202
• https://git.kernel.org/stable/c/1486cc18be3e2b4c2a730f4a1b0448d009381b3d
• https://git.kernel.org/stable/c/10e9f05f7fd0a103886a867ec8afe621fe4b906a
• https://git.kernel.org/stable/c/157ca7d1af45f87aa14a286754f19c3f72386988
• https://git.kernel.org/stable/c/505753ec2594c6af09a601f0dd60be7d840c1d2d