GHSA-FW87-5P3G-2R3P

Vulnerability from github – Published: 2025-10-23 18:31 – Updated: 2025-10-23 18:31
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

can: gs_usb: gs_usb_open/close(): fix memory leak

The gs_usb driver appears to suffer from a malady common to many USB CAN adapter drivers in that it performs usb_alloc_coherent() to allocate a number of USB request blocks (URBs) for RX, and then later relies on usb_kill_anchored_urbs() to free them, but this doesn't actually free them. As a result, this may be leaking DMA memory that's been used by the driver.

This commit is an adaptation of the techniques found in the esd_usb2 driver where a similar design pattern led to a memory leak. It explicitly frees the RX URBs and their DMA memory via a call to usb_free_coherent(). Since the RX URBs were allocated in the gs_can_open(), we remove them in gs_can_close() rather than in the disconnect function as was done in esd_usb2.

For more information, see the 928150fad41b ("can: esd_usb2: fix memory leak").

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2022-49661"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:41Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: gs_usb: gs_usb_open/close(): fix memory leak\n\nThe gs_usb driver appears to suffer from a malady common to many USB\nCAN adapter drivers in that it performs usb_alloc_coherent() to\nallocate a number of USB request blocks (URBs) for RX, and then later\nrelies on usb_kill_anchored_urbs() to free them, but this doesn\u0027t\nactually free them. As a result, this may be leaking DMA memory that\u0027s\nbeen used by the driver.\n\nThis commit is an adaptation of the techniques found in the esd_usb2\ndriver where a similar design pattern led to a memory leak. It\nexplicitly frees the RX URBs and their DMA memory via a call to\nusb_free_coherent(). Since the RX URBs were allocated in the\ngs_can_open(), we remove them in gs_can_close() rather than in the\ndisconnect function as was done in esd_usb2.\n\nFor more information, see the 928150fad41b (\"can: esd_usb2: fix memory\nleak\").",
  "id": "GHSA-fw87-5p3g-2r3p",
  "modified": "2025-10-23T18:31:05Z",
  "published": "2025-10-23T18:31:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49661"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e60230bc64355c80abe993d1719fdb318094e20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bda24ef95c0311ab93bda00db40486acf30bd0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/339fa9f80d3b94177a7a459c6d115d3b56007d5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f655b5e13fa4b27e915b6c209ac0da74fd75963"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1d806bc29ff7ffe0e2a023583c8720ed96cb0b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0b8e223998866b3e7b2895927d4e9689b0a80d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d91492638b054f4a359621ef216242be5973ed6b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffb6cc6601ec7c8fa963dcf76025df4a02f2cf5c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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