CVE-2026-89592 accel/rocket: fix NULL dereference and integer overflow in rocket_job_push()

What is CVE-2026-89592?

CVE-2026-89592 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: fix NULL dereference and integer overflow in rocket_job_push()

rocket_job_push() allocates a temporary array to hold all input and output GEM object pointers:

bos = kvmalloc_array(job->in_bo_count + job->out_bo_count, sizeof(void *), GFP_KERNEL); memcpy(bos, job->in_bos, job->in_bo_count * sizeof(void *)); memcpy(&bos[job->in_bo_count], job->out_bos, ...);

Two bugs exist:

1. Missing NULL check: if kvmalloc_array() fails, bos is NULL and the subsequent memcpy() dereferences it, causing a kernel NULL pointer dereference.

2. Integer overflow: in_bo_count and out_bo_count are both u32, set directly from userspace-supplied in_bo_handle_count and out_bo_handle_count with no prior validation. Their sum is computed in u32 arithmetic and can wrap to a smaller value, causing the allocation count passed to kvmalloc_array() to be smaller than intended. Subsequent uses still operate on the original counts when copying and locking objects, which may lead to out-of-bounds accesses on the temporary array.

Fix by using check_add_overflow() to detect count overflow before the allocation, and adding a NULL check on the allocation result.

Which versions are affected by CVE-2026-89592?

How do I fix CVE-2026-89592?

Apply the vendor's patch.

Is CVE-2026-89592 being exploited?

There is no known exploitation of CVE-2026-89592 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-89592, DEBIAN-CVE-2026-89592, GHSA-37xg-5m8h-6hgw, UBUNTU-CVE-2026-89592.