# CVE-2026-89592

## Summary

- **CVE ID:** CVE-2026-89592
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## 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.

## Affected Products

- Linux — Linux (0810d5ad88a18f1e6d549853a388ad0316f74e36)
- Linux — Linux (6.18)
- Linux — Linux (0)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/c1a5bf1b6e1d5944183dcef3844a18c17219af4d)
- [CNA](https://git.kernel.org/stable/c/dfff90a6eb2258e3b867994ae17af4a7ba3504d2)
- [CNA](https://git.kernel.org/stable/c/a85402bff218f2b8f0d806e46c16c2f3d49cdda7)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 11.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._