CVE-2026-89591 accel/rocket: initialize job domain before cleanup paths
A local attacker can trigger a null pointer dereference in the Rocket accelerator driver, causing a kernel crash and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89591?
CVE-2026-89591 is a vulnerability in Linux, published on 11 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:
accel/rocket: initialize job domain before cleanup paths
rocket_ioctl_submit_job() releases rjob through rocket_job_put() on allocation error paths. rocket_job_cleanup() unconditionally calls rocket_iommu_domain_put(job->domain), but job->domain is assigned only after task copying and BO lookups. A failure before that assignment can therefore clean up a job with a NULL domain pointer.
Take the per-file domain reference before the first error path can release rjob. Also clear rjob->tasks after freeing it in rocket_copy_tasks(), so the common cleanup path cannot free the task array again after a task-copy error.
Which versions are affected by CVE-2026-89591?
How do I fix CVE-2026-89591?
Apply the vendor's patch.
Is CVE-2026-89591 being exploited?
There is no known exploitation of CVE-2026-89591 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89591, DEBIAN-CVE-2026-89591, GHSA-pp5j-w2pr-xvv3, UBUNTU-CVE-2026-89591.