CVE-2026-89592
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel's accel/rocket driver, rocket_job_push() allocates a temporary array to hold input and output GEM object pointers. Two bugs exist: a missing NULL check after a failed kvmalloc_array() causing a NULL pointer dereference, and an integer overflow when summing in_bo_count and out_bo_count (both u32) that can wrap to a smaller value, leading to an undersized allocation and subsequent out-of-bounds accesses on the temporary array.
Risk Assessment
A local attacker could exploit the integer overflow and missing NULL check to cause a kernel crash or potentially achieve code execution in kernel context via out-of-bounds access. This poses a serious threat to confidentiality, integrity, and availability.
Recommendation
Update the Linux kernel to a version containing the fix that uses check_add_overflow() to detect count overflow before allocation and adds a NULL check on the allocation result.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS