Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-08-04 06:23 – Updated: 2026-08-04 06:23

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

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/40bbbf2e91fd60715…
https://git.kernel.org/stable/c/ca9f8c09845fb8c51…
https://git.kernel.org/stable/c/d03a740e087de7dcb…
https://git.kernel.org/stable/c/875115b82c295277b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 628329d52474323938a03826941e166bc7c8eff4 , < 40bbbf2e91fd60715525bf0405c67876af817edf (git) Affected: 628329d52474323938a03826941e166bc7c8eff4 , < ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49 (git) Affected: 628329d52474323938a03826941e166bc7c8eff4 , < d03a740e087de7dcb2a26dc1123377bd3d1d84ca (git) Affected: 628329d52474323938a03826941e166bc7c8eff4 , < 875115b82c295277b81b6dfee7debc725f44e854 (git)
Linux	Linux	Affected: 3.10 Unaffected: 0 , < 3.10 (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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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/misc/ims-pcu.c"
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          "versions": [
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              "version": "0",
              "versionType": "semver"
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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]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-04T06:23:24.089Z",
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        "shortName": "Linux"
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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()",
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  "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": "2026-08-04T06:23:24.089Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-08-04",
      "epss": "0.00173",
      "percentile": "0.06947"
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  }
}

GHSA-36CQ-F2M4-833W

Vulnerability from github – Published: 2026-08-04 09:31 – Updated: 2026-08-04 09:31

Details

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]

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64565"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-04T07:16:31Z",
    "severity": null
  },
  "details": "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": "GHSA-36cq-f2m4-833w",
  "modified": "2026-08-04T09:31:35Z",
  "published": "2026-08-04T09:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64565"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40bbbf2e91fd60715525bf0405c67876af817edf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/875115b82c295277b81b6dfee7debc725f44e854"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca9f8c09845fb8c51b6d447f6428eecd1b8b0a49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d03a740e087de7dcb2a26dc1123377bd3d1d84ca"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

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

GHSA-36CQ-F2M4-833W

Tags

Sightings

Nomenclature