CVE-2026-99184 (GCVE-0-2026-99184)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-28 10:35
VLAI
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 valid value for type '_Bool' Workqueue: devfreq_wq devfreq_monitor Record how many slots were allocated and search all of them. Every core is then found on removal, num_cores reaches zero, the device is torn down and a later bind starts from a clean rdev. This does not make unbinding a single core out of several work. probe still takes num_cores as the slot to fill, so rebinding one core while its siblings stay bound would write over a slot that is already in use, and rocket_open() still reaches for cores[0] whether or not anything is there. Both of those want more thought than a fix should carry. Found by unbinding and rebinding all three cores on an Orange Pi 5 Plus. With this applied, 25 unbind/rebind rounds and 5 module unload/reload rounds run clean there: the cores land in slots 0, 1 and 2 every time, whichever order they are bound in, and the shared supply goes back to a single user after each round.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ed98261b41687323ffa02ca20fef1e60b38fd1aa , < 5078c91f5c84bb383d0a10ed39856f98575e39cf (git)
Affected: ed98261b41687323ffa02ca20fef1e60b38fd1aa , < 134451cf95cb6aa04b725fbfa04e878d072756f5 (git)
Affected: ed98261b41687323ffa02ca20fef1e60b38fd1aa , < 6eff1d69dae808a1518aee5a58d0853a8db3f1be (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/rocket/rocket_device.c",
            "drivers/accel/rocket/rocket_device.h",
            "drivers/accel/rocket/rocket_drv.c"
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            "drivers/accel/rocket/rocket_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.18"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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                  "vulnerable": true
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: search every core slot when a core is removed\n\nrocket_remove() decrements rdev-\u003enum_cores for each core it removes,\nwhile find_core_for_dev() searches slots 0 to num_cores - 1. Unbinding\nthe cores in the order they were bound therefore loses the last one: by\nthe time it is removed the search range has already shrunk past its\nslot, so find_core_for_dev() returns -1 and rocket_remove() gives up\nwithout doing anything.\n\nnum_cores never reaches zero, rocket_device_fini() never runs, and the\nfile-scoped rdev keeps pointing at a device that is going away. Binding\nthe cores again starts from that stale count, because rocket_probe()\ntakes rdev-\u003enum_cores as the slot to fill. On an RK3588, which describes\nthree cores, the second round lands on slots 1, 2 and 3 while rdev-\u003ecores\nwas allocated with room for three:\n\n  rocket fdab0000.npu: Rockchip NPU core 1 version: 1179210309\n  rocket fdac0000.npu: Rockchip NPU core 2 version: 1179210309\n  rocket fdad0000.npu: Rockchip NPU core 3 version: 1179210309\n\nThe write to rdev-\u003ecores[3] is past the end of the array.\n\nNothing in tree reads the core array often enough to notice, so the\noverrun is silent today. It turned up while testing a devfreq series on\ntop of this, where a worker walks every core a few times a second, and\nUBSAN caught the first bool it read out of the overrun entry:\n\n  UBSAN: invalid-load in drivers/accel/rocket/rocket_devfreq.c:47:10\n  load of value 5 is not a valid value for type \u0027_Bool\u0027\n  Workqueue: devfreq_wq devfreq_monitor\n\nRecord how many slots were allocated and search all of them. Every core\nis then found on removal, num_cores reaches zero, the device is torn down\nand a later bind starts from a clean rdev.\n\nThis does not make unbinding a single core out of several work. probe\nstill takes num_cores as the slot to fill, so rebinding one core while\nits siblings stay bound would write over a slot that is already in use,\nand rocket_open() still reaches for cores[0] whether or not anything is\nthere. Both of those want more thought than a fix should carry.\n\nFound by unbinding and rebinding all three cores on an Orange Pi 5 Plus.\nWith this applied, 25 unbind/rebind rounds and 5 module unload/reload\nrounds run clean there: the cores land in slots 0, 1 and 2 every time,\nwhichever order they are bound in, and the shared supply goes back to a\nsingle user after each round."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:35:42.469Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/5078c91f5c84bb383d0a10ed39856f98575e39cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/134451cf95cb6aa04b725fbfa04e878d072756f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/6eff1d69dae808a1518aee5a58d0853a8db3f1be"
        }
      ],
      "title": "accel/rocket: search every core slot when a core is removed",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99184",
    "datePublished": "2026-10-28T10:35:42.469Z",
    "dateReserved": "2026-09-25T10:25:14.399Z",
    "dateUpdated": "2026-10-28T10:35:42.469Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-11-09",
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      "percentile": "0.05955"
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                "product": "Linux",
                "programFiles": [
                  "drivers/accel/rocket/rocket_device.c",
                  "drivers/accel/rocket/rocket_device.h",
                  "drivers/accel/rocket/rocket_drv.c"
                ],
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                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
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                    "version": "7.2.13",
                    "versionType": "semver"
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              }
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/rocket: search every core slot when a core is removed\n\nrocket_remove() decrements rdev-\u003enum_cores for each core it removes,\nwhile find_core_for_dev() searches slots 0 to num_cores - 1. Unbinding\nthe cores in the order they were bound therefore loses the last one: by\nthe time it is removed the search range has already shrunk past its\nslot, so find_core_for_dev() returns -1 and rocket_remove() gives up\nwithout doing anything.\n\nnum_cores never reaches zero, rocket_device_fini() never runs, and the\nfile-scoped rdev keeps pointing at a device that is going away. Binding\nthe cores again starts from that stale count, because rocket_probe()\ntakes rdev-\u003enum_cores as the slot to fill. On an RK3588, which describes\nthree cores, the second round lands on slots 1, 2 and 3 while rdev-\u003ecores\nwas allocated with room for three:\n\n  rocket fdab0000.npu: Rockchip NPU core 1 version: 1179210309\n  rocket fdac0000.npu: Rockchip NPU core 2 version: 1179210309\n  rocket fdad0000.npu: Rockchip NPU core 3 version: 1179210309\n\nThe write to rdev-\u003ecores[3] is past the end of the array.\n\nNothing in tree reads the core array often enough to notice, so the\noverrun is silent today. It turned up while testing a devfreq series on\ntop of this, where a worker walks every core a few times a second, and\nUBSAN caught the first bool it read out of the overrun entry:\n\n  UBSAN: invalid-load in drivers/accel/rocket/rocket_devfreq.c:47:10\n  load of value 5 is not a valid value for type \u0027_Bool\u0027\n  Workqueue: devfreq_wq devfreq_monitor\n\nRecord how many slots were allocated and search all of them. Every core\nis then found on removal, num_cores reaches zero, the device is torn down\nand a later bind starts from a clean rdev.\n\nThis does not make unbinding a single core out of several work. probe\nstill takes num_cores as the slot to fill, so rebinding one core while\nits siblings stay bound would write over a slot that is already in use,\nand rocket_open() still reaches for cores[0] whether or not anything is\nthere. Both of those want more thought than a fix should carry.\n\nFound by unbinding and rebinding all three cores on an Orange Pi 5 Plus.\nWith this applied, 25 unbind/rebind rounds and 5 module unload/reload\nrounds run clean there: the cores land in slots 0, 1 and 2 every time,\nwhichever order they are bound in, and the shared supply goes back to a\nsingle user after each round."
          }
        ],
        "id": "CVE-2026-99184",
        "lastModified": "2026-10-28T11:17:39.243",
        "metrics": {},
        "published": "2026-10-28T11:17:39.243",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/134451cf95cb6aa04b725fbfa04e878d072756f5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T04:16:19+00:00",
      "cve": "CVE-2026-99184",
      "id": "CVE-2026-99184",
      "initial_release_date": "2026-10-28T10:35:42.469000+00:00",
      "product_status:known_not_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: accel/rocket: Denial of Service via out-of-bounds write during core rebinding",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99184.json",
      "version": "3"
    }
  }
}



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