CVE-2026-64565 (GCVE-0-2026-64565)
Vulnerability from cvelistv5
Published
2026-08-04 06:23
Modified
2026-08-19 16:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data() The `ims_pcu_process_data()` processes incoming URB data byte by byte. However, it fails to check if the `read_pos` index exceeds IMS_PCU_BUF_SIZE. If a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE, `read_pos` will increment indefinitely. Moreover, since `read_pos` is located immediately after `read_buf`, the attacker can overwrite `read_pos` itself to arbitrarily control the index. This manipulated `read_pos` is subsequently used in `ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a heap buffer overflow. Specifically, an attacker can overwrite the `cmd_done.wait.head` located at offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`. Consequently, when the driver calls `complete(&pcu->cmd_done)`, it triggers a control flow hijack by using the manipulated pointer. Fix this by adding a bounds check for `read_pos` before writing to `read_buf`. If the packet is too long, discard it, log a warning, and reset the parser state. [dtor: factor out resetting packet state, reset checksum as well]
References
Impacted products
Vendor Product Version
Linux Linux Version: 628329d52474323938a03826941e166bc7c8eff4
Version: 628329d52474323938a03826941e166bc7c8eff4
Version: 628329d52474323938a03826941e166bc7c8eff4
Version: 628329d52474323938a03826941e166bc7c8eff4
Version: 628329d52474323938a03826941e166bc7c8eff4
Version: 628329d52474323938a03826941e166bc7c8eff4
Version: 628329d52474323938a03826941e166bc7c8eff4
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{
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          "programFiles": [
            "drivers/input/misc/ims-pcu.c"
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      "cpeApplicability": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()\n\nThe `ims_pcu_process_data()` processes incoming URB data byte by byte.\nHowever, it fails to check if the `read_pos` index exceeds\nIMS_PCU_BUF_SIZE.\n\nIf a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE,\n`read_pos` will increment indefinitely. Moreover, since `read_pos` is\nlocated immediately after `read_buf`, the attacker can overwrite\n`read_pos` itself to arbitrarily control the index.\n\nThis manipulated `read_pos` is subsequently used in\n`ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a\nheap buffer overflow.\n\nSpecifically, an attacker can overwrite the `cmd_done.wait.head` located\nat offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`.\nConsequently, when the driver calls `complete(\u0026pcu-\u003ecmd_done)`, it\ntriggers a control flow hijack by using the manipulated pointer.\n\nFix this by adding a bounds check for `read_pos` before writing to\n`read_buf`. If the packet is too long, discard it, log a warning,\nand reset the parser state.\n\n[dtor: factor out resetting packet state, reset checksum as well]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:28:39.404Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/06cfff93fd40441292567b999091beab11c74504"
        },
        {
          "url": "https://git.kernel.org/stable/c/992a7173364dcf63e30012af43da3c2f279839f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a801bc75ba1d121d0ed60e7234f93ba5651d87d"
        },
        {
          "url": "https://git.kernel.org/stable/c/40bbbf2e91fd60715525bf0405c67876af817edf"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49"
        },
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          "url": "https://git.kernel.org/stable/c/d03a740e087de7dcb2a26dc1123377bd3d1d84ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/875115b82c295277b81b6dfee7debc725f44e854"
        }
      ],
      "title": "Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64565",
    "datePublished": "2026-08-04T06:23:24.089Z",
    "dateReserved": "2026-07-19T15:36:31.797Z",
    "dateUpdated": "2026-08-19T16:28:39.404Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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