CVE-2026-89592 (GCVE-0-2026-89592)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-10-19 08:49
VLAI
Title
accel/rocket: fix NULL dereference and integer overflow in rocket_job_push()
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0810d5ad88a18f1e6d549853a388ad0316f74e36 , < c1a5bf1b6e1d5944183dcef3844a18c17219af4d (git)
Affected: 0810d5ad88a18f1e6d549853a388ad0316f74e36 , < dfff90a6eb2258e3b867994ae17af4a7ba3504d2 (git)
Affected: 0810d5ad88a18f1e6d549853a388ad0316f74e36 , < a85402bff218f2b8f0d806e46c16c2f3d49cdda7 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: fix NULL dereference and integer overflow in rocket_job_push()\n\nrocket_job_push() allocates a temporary array to hold all input and\noutput GEM object pointers:\n\n    bos = kvmalloc_array(job-\u003ein_bo_count + job-\u003eout_bo_count,\n                         sizeof(void *), GFP_KERNEL);\n    memcpy(bos, job-\u003ein_bos, job-\u003ein_bo_count * sizeof(void *));\n    memcpy(\u0026bos[job-\u003ein_bo_count], job-\u003eout_bos, ...);\n\nTwo bugs exist:\n\n1. Missing NULL check: if kvmalloc_array() fails, bos is NULL and\n   the subsequent memcpy() dereferences it, causing a kernel NULL\n   pointer dereference.\n\n2. Integer overflow: in_bo_count and out_bo_count are both u32, set\n   directly from userspace-supplied in_bo_handle_count and\n   out_bo_handle_count with no prior validation. Their sum is computed\n   in u32 arithmetic and can wrap to a smaller value, causing the\n   allocation count passed to kvmalloc_array() to be smaller than\n   intended. Subsequent uses still operate on the original counts when\n   copying and locking objects, which may lead to out-of-bounds accesses\n   on the temporary array.\n\nFix by using check_add_overflow() to detect count overflow before the\nallocation, and adding a NULL check on the allocation result."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:49:24.772Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/a85402bff218f2b8f0d806e46c16c2f3d49cdda7"
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      ],
      "title": "accel/rocket: fix NULL dereference and integer overflow in rocket_job_push()",
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  "cveMetadata": {
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    "cveId": "CVE-2026-89592",
    "datePublished": "2026-09-11T19:44:55.813Z",
    "dateReserved": "2026-09-11T19:38:34.730Z",
    "dateUpdated": "2026-10-19T08:49:24.772Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: fix NULL dereference and integer overflow in rocket_job_push()\n\nrocket_job_push() allocates a temporary array to hold all input and\noutput GEM object pointers:\n\n    bos = kvmalloc_array(job-\u003ein_bo_count + job-\u003eout_bo_count,\n                         sizeof(void *), GFP_KERNEL);\n    memcpy(bos, job-\u003ein_bos, job-\u003ein_bo_count * sizeof(void *));\n    memcpy(\u0026bos[job-\u003ein_bo_count], job-\u003eout_bos, ...);\n\nTwo bugs exist:\n\n1. Missing NULL check: if kvmalloc_array() fails, bos is NULL and\n   the subsequent memcpy() dereferences it, causing a kernel NULL\n   pointer dereference.\n\n2. Integer overflow: in_bo_count and out_bo_count are both u32, set\n   directly from userspace-supplied in_bo_handle_count and\n   out_bo_handle_count with no prior validation. Their sum is computed\n   in u32 arithmetic and can wrap to a smaller value, causing the\n   allocation count passed to kvmalloc_array() to be smaller than\n   intended. Subsequent uses still operate on the original counts when\n   copying and locking objects, which may lead to out-of-bounds accesses\n   on the temporary array.\n\nFix by using check_add_overflow() to detect count overflow before the\nallocation, and adding a NULL check on the allocation result."
          }
        ],
        "id": "CVE-2026-89592",
        "lastModified": "2026-10-19T09:17:55.493",
        "metrics": {},
        "published": "2026-09-11T20:19:43.807",
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}



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