accel/rocket: search every core slot when a core is removed

{
  "id": "6d0fd9465cd38e546a34909b33fc165a52aaf779e94d08898693c946345253a6",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-99184",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "accel/rocket: search every core slot when a core is removed",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: accel/rocket: search every core slot when a core is removed rocket_remove() decrements rdev->num_cores for each core it removes, while find_core_for_dev() searches slots 0 to num_cores - 1. Unbinding the cores in the order they were bound therefore loses the last one: by the time it is removed the search range has already shrunk past its slot, so find_core_for_dev() returns -1 and rocket_remove() gives up without doing anything. num_cores never reaches zero, rocket_device_fini() never runs, and the file-scoped rdev keeps pointing at a device that is going away. Binding the cores again starts from that stale count, because rocket_probe() takes rdev->num_cores as the slot to fill. On an RK3588, which describes three cores, the second round lands on slots 1, 2 and 3 while rdev->cores was allocated with room for three: rocket fdab0000.npu: Rockchip NPU core 1 version: 1179210309 rocket fdac0000.npu: Rockchip NPU core 2 version: 1179210309 rocket fdad0000.npu: Rockchip NPU core 3 version: 1179210309 The write to rdev->cores[3] is past the end of the array. Nothing in tree reads the core array often enough to notice, so the overrun is silent today. It turned up while testing a devfreq series on top of this, where a worker walks every core a few times a second, and UBSAN caught the first bool it read out of the overrun entry: UBSAN: invalid-load in drivers/accel/rocket/rocket_devfreq.c:47:10 load of value 5 is not a",
    "evidence": "cve:CVE-2026-99184",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-99184",
      "aliases": [
        "CVE-2026-99184"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "ed98261b41687323ffa02ca20fef1e60b38fd1aa",
              "lessThan": "5078c91f5c84bb383d0a10ed39856f98575e39cf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ed98261b41687323ffa02ca20fef1e60b38fd1aa",
              "lessThan": "134451cf95cb6aa04b725fbfa04e878d072756f5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ed98261b41687323ffa02ca20fef1e60b38fd1aa",
              "lessThan": "6eff1d69dae808a1518aee5a58d0853a8db3f1be",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/accel/rocket/rocket_device.c",
            "drivers/accel/rocket/rocket_device.h",
            "drivers/accel/rocket/rocket_drv.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.59",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.13",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/accel/rocket/rocket_device.c",
            "drivers/accel/rocket/rocket_device.h",
            "drivers/accel/rocket/rocket_drv.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-28T10:35:42.469Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/5078c91f5c84bb383d0a10ed39856f98575e39cf",
        "https://git.kernel.org/stable/c/134451cf95cb6aa04b725fbfa04e878d072756f5",
        "https://git.kernel.org/stable/c/6eff1d69dae808a1518aee5a58d0853a8db3f1be"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-28T10:35:42.469Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-99184",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 425364,
  "published_at": "2026-10-28T10:35:42.469+00:00"
}