CVE-2026-92514RDMA/erdma: Fix CEQ tasklet use-after-free on removal

Official 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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/0e8b78dabb1f156db05ffe74c6eae861167c7c21
• https://git.kernel.org/stable/c/6e129c1310abfa786a510cc63e69c5ef12349048
• https://git.kernel.org/stable/c/f738c0a372d36a10dfae6dc357717c13b2aa72f4
• https://git.kernel.org/stable/c/a60c36d8d17f1b86705523d5eb6d290df28831e5
• https://git.kernel.org/stable/c/61a25b8d333e1eb2a189881d516f8d5194e26840
• https://git.kernel.org/stable/c/0ca79979384f031d710c4b3bae065dcb5d95aca3