CVE-2026-92514

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/erdma: Fix CEQ tasklet use-after-free on removal

Each CEQ interrupt handler only schedules eqc->tasklet. The tasklet calls

erdma_ceq_completion_handler(), which reads the DMA-coherent EQ ring

through get_next_valid_eqe() and updates eq->dbrec through notify_eq().

erdma_ceqs_uninit() frees each CEQ IRQ and then destroys its EQ.

free_irq() prevents another hard IRQ and waits for an in-flight handler,

but it does not drain a tasklet that the handler already scheduled. The

tasklet can therefore access eq->qbuf or eq->dbrec after

erdma_eq_destroy() frees them.

Clearing ceq_cb->ready does not synchronize with a tasklet that already

passed the check at the start of erdma_ceq_completion_handler().

Kill the tasklet after free_irq(), when no handler can schedule it again,

and before erdma_ceq_uninit_one() releases the EQ buffers.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References