CVE-2026-92514 RDMA/erdma: Fix CEQ tasklet use-after-free on removal
A use-after-free in the Linux kernel RDMA erdma driver allows local attackers to execute code or cause a denial of service during device removal.
- 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-2026-92514?
CVE-2026-92514 is an use after free vulnerability in Linux, published on 17 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:
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.
Which versions are affected by CVE-2026-92514?
How do I fix CVE-2026-92514?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-92514 being exploited?
There is no known exploitation of CVE-2026-92514 in the wild and no public exploit code.
Sources
Also known as AZL-102210, BELL-CVE-2026-92514, DEBIAN-CVE-2026-92514, GHSA-mcv5-xwww-xj32, UBUNTU-CVE-2026-92514.