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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-11 19:44
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
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-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/rocket/rocket_job.c"
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                  "versionStartIncluding": "6.18",
                  "vulnerable": true
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                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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": "2026-09-11T19:44:55.813Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c1a5bf1b6e1d5944183dcef3844a18c17219af4d"
        },
        {
          "url": "https://git.kernel.org/stable/c/dfff90a6eb2258e3b867994ae17af4a7ba3504d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a85402bff218f2b8f0d806e46c16c2f3d49cdda7"
        }
      ],
      "title": "accel/rocket: fix NULL dereference and integer overflow in rocket_job_push()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89592",
    "datePublished": "2026-09-11T19:44:55.813Z",
    "dateReserved": "2026-09-11T19:38:34.730Z",
    "dateUpdated": "2026-09-11T19:44:55.813Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89592",
      "date": "2026-09-15",
      "epss": "0.00206",
      "percentile": "0.10916"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89592\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:43.807\",\"lastModified\":\"2026-09-11T20:19:43.807\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/accel/rocket/rocket_job.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0810d5ad88a18f1e6d549853a388ad0316f74e36\",\"lessThan\":\"c1a5bf1b6e1d5944183dcef3844a18c17219af4d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0810d5ad88a18f1e6d549853a388ad0316f74e36\",\"lessThan\":\"dfff90a6eb2258e3b867994ae17af4a7ba3504d2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0810d5ad88a18f1e6d549853a388ad0316f74e36\",\"lessThan\":\"a85402bff218f2b8f0d806e46c16c2f3d49cdda7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/accel/rocket/rocket_job.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/a85402bff218f2b8f0d806e46c16c2f3d49cdda7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c1a5bf1b6e1d5944183dcef3844a18c17219af4d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dfff90a6eb2258e3b867994ae17af4a7ba3504d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-15T04:48:37+00:00",
      "cve": "CVE-2026-89592",
      "id": "CVE-2026-89592",
      "initial_release_date": "2026-09-11T19:44:55.813000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: accel/rocket NULL dereference and integer overflow",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89592.json",
      "version": "3"
    }
  }
}



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