CVE-2026-64273 (GCVE-0-2026-64273)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: iforce - bound the device-reported force-feedback effect index iforce_process_packet() handles a status report (packet id 0x02) by taking a force-feedback effect index straight from the device wire and using it to address the per-effect state array: i = data[1] & 0x7f; if (data[1] & 0x80) { if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) ... } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) { ... } The index is masked only with 0x7f, so it ranges 0..127, but core_effects[] holds only IFORCE_EFFECTS_MAX (32) entries. For an index of 32..127 the test_and_set_bit()/test_and_clear_bit() is an out-of-bounds single-bit read-modify-write past the array. core_effects[] is the second-to-last member of struct iforce, so the write lands in the trailing members and beyond the embedding kzalloc()'d iforce_serio / iforce_usb object. data[1] is unvalidated device payload on both transports (the USB interrupt endpoint and serio), and the status path is not gated on force feedback being present, so a malicious or counterfeit device can set or clear a bit at an attacker-chosen offset past the object. Reject an out-of-range index instead of indexing with it. Bound against the array dimension IFORCE_EFFECTS_MAX rather than dev->ff->max_effects so the check guarantees memory safety regardless of how many effects the device registered. A legitimate "effect started/stopped" status always carries an index below IFORCE_EFFECTS_MAX, so well-formed devices are unaffected; the neighbouring mark_core_as_ready() loop is already bounded and is left untouched.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/joystick/iforce/iforce-packets.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.12"
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              "version": "0",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: iforce - bound the device-reported force-feedback effect index\n\niforce_process_packet() handles a status report (packet id 0x02) by\ntaking a force-feedback effect index straight from the device wire and\nusing it to address the per-effect state array:\n\n\ti = data[1] \u0026 0x7f;\n\tif (data[1] \u0026 0x80) {\n\t\tif (!test_and_set_bit(FF_CORE_IS_PLAYED,\n\t\t\t\t      iforce-\u003ecore_effects[i].flags))\n\t\t\t...\n\t} else if (test_and_clear_bit(FF_CORE_IS_PLAYED,\n\t\t\t\t      iforce-\u003ecore_effects[i].flags)) {\n\t\t...\n\t}\n\nThe index is masked only with 0x7f, so it ranges 0..127, but\ncore_effects[] holds only IFORCE_EFFECTS_MAX (32) entries.  For an index\nof 32..127 the test_and_set_bit()/test_and_clear_bit() is an\nout-of-bounds single-bit read-modify-write past the array.  core_effects[]\nis the second-to-last member of struct iforce, so the write lands in the\ntrailing members and beyond the embedding kzalloc()\u0027d iforce_serio /\niforce_usb object.\n\ndata[1] is unvalidated device payload on both transports (the USB\ninterrupt endpoint and serio), and the status path is not gated on force\nfeedback being present, so a malicious or counterfeit device can set or\nclear a bit at an attacker-chosen offset past the object.\n\nReject an out-of-range index instead of indexing with it.  Bound against\nthe array dimension IFORCE_EFFECTS_MAX rather than dev-\u003eff-\u003emax_effects so\nthe check guarantees memory safety regardless of how many effects the\ndevice registered.  A legitimate \"effect started/stopped\" status always\ncarries an index below IFORCE_EFFECTS_MAX, so well-formed devices are\nunaffected; the neighbouring mark_core_as_ready() loop is already bounded\nand is left untouched."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:52:27.750Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b1b79e89bc33e4c682d3df7ae2aadc62b5a0c310"
        },
        {
          "url": "https://git.kernel.org/stable/c/d10b0507fa0f5b46764b178e3271f9012f2df677"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c0f2901c9d325d4a0574c4237fd507810d225ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/c21295616a8a52b9a5f18cd4ca8c73030eda3d4f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5fa31f0550b55d80045669ae9080dd5b88abffa"
        },
        {
          "url": "https://git.kernel.org/stable/c/70019779325f2bb5f5a4098e91e79c655f50fcef"
        },
        {
          "url": "https://git.kernel.org/stable/c/a40250f97c312e000e3616c9074022311a0efbc3"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e9943d2e4c63496b6ca84bc66fd3c71d40558e2"
        }
      ],
      "title": "Input: iforce - bound the device-reported force-feedback effect index",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64273",
    "datePublished": "2026-07-25T08:49:19.416Z",
    "dateReserved": "2026-07-19T15:36:31.776Z",
    "dateUpdated": "2026-08-17T04:52:27.750Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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