CVE-2026-98004 iommu/riscv: Serialize command queue publishing
A race condition in the RISC-V IOMMU driver can cause system hangs or denial of service when the command queue is full.
- 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-2026-98004?
CVE-2026-98004 is a vulnerability in Linux, published on 25 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:
iommu/riscv: Serialize command queue publishing
Serialize command queue publishing so software producer state advances only after a command is written and the hardware tail is updated. Wait for hardware consumption outside the queue lock when the command queue is full so other CPUs are not blocked behind a long poll.
Which versions are affected by CVE-2026-98004?
How do I fix CVE-2026-98004?
Apply the vendor's patch.
Is CVE-2026-98004 being exploited?
There is no known exploitation of CVE-2026-98004 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98004, DEBIAN-CVE-2026-98004, GHSA-942c-qgwv-hv77, UBUNTU-CVE-2026-98004.