CVE-2026-89590 accel/rocket: Fix error path handling in rocket_job_run()
A local attacker can trigger a resource leak in the Rocket NPU driver, preventing device suspension and causing a 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-2026-89590?
CVE-2026-89590 is a denial of service 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: Fix error path handling in rocket_job_run()
In rocket_job_run(), after taking an extra fence reference for job->done_fence via dma_fence_get(), the error paths have three bugs:
- The dma_fence reference held by job->done_fence is never released, causing a reference leak. - pm_runtime_get_sync() increments the usage counter even on failure, but the error path does not decrement it, leaking the runtime PM reference and preventing the NPU from suspending. - A valid but unsignaled fence is returned to the DRM scheduler, which triggers WARN("Fence ... released with pending signals!") when the scheduler drops its reference.
Fix by replacing pm_runtime_get_sync() with pm_runtime_resume_and_get() which auto-balances the usage counter on failure, releasing both fence references on error, and returning ERR_PTR(ret) instead of the unsignaled fence.
[tomeu: Refactored error paths to use consolidated goto labels]
Which versions are affected by CVE-2026-89590?
How do I fix CVE-2026-89590?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-89590 being exploited?
There is no known exploitation of CVE-2026-89590 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89590, DEBIAN-CVE-2026-89590, GHSA-8m8f-887v-xxcc, UBUNTU-CVE-2026-89590.