CVE-2026-64565 (GCVE-0-2026-64565)

Vulnerability from cvelistv5 – Published: 2026-08-04 06:23 – Updated: 2026-08-19 16:28
VLAI
Title
Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()
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]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 628329d52474323938a03826941e166bc7c8eff4 , < 06cfff93fd40441292567b999091beab11c74504 (git)
Affected: 628329d52474323938a03826941e166bc7c8eff4 , < 992a7173364dcf63e30012af43da3c2f279839f9 (git)
Affected: 628329d52474323938a03826941e166bc7c8eff4 , < 3a801bc75ba1d121d0ed60e7234f93ba5651d87d (git)
Affected: 628329d52474323938a03826941e166bc7c8eff4 , < 40bbbf2e91fd60715525bf0405c67876af817edf (git)
Affected: 628329d52474323938a03826941e166bc7c8eff4 , < ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49 (git)
Affected: 628329d52474323938a03826941e166bc7c8eff4 , < d03a740e087de7dcb2a26dc1123377bd3d1d84ca (git)
Affected: 628329d52474323938a03826941e166bc7c8eff4 , < 875115b82c295277b81b6dfee7debc725f44e854 (git)
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Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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]"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:28:39.404Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2026-08-04T06:23:24.089Z",
    "dateReserved": "2026-07-19T15:36:31.797Z",
    "dateUpdated": "2026-08-19T16:28:39.404Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "percentile": "0.08232"
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      "cve": "CVE-2026-64565",
      "id": "msrc_CVE-2026-64565",
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64565.json",
      "version": "2"
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            "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]"
          }
        ],
        "id": "CVE-2026-64565",
        "lastModified": "2026-08-19T17:20:16.457",
        "metrics": {},
        "published": "2026-08-04T07:16:31.477",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-25T15:02:59+00:00",
      "cve": "CVE-2026-64565",
      "id": "CVE-2026-64565",
      "initial_release_date": "2026-08-04T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64565.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:38:02Z",
      "cve": "CVE-2026-64565",
      "id": "CVE-2026-64565",
      "initial_release_date": "2026-08-06T23:56:38Z",
      "product_status:known_affected": "671",
      "product_status:known_not_affected": "60",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64565",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64565.json",
      "version": "9"
    }
  }
}



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