ghsa-qc5x-h4r4-86f3
Vulnerability from github
Published
2025-03-27 18:31
Modified
2025-03-28 18:33
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait

While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind.

Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.

Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49755"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-27T17:15:40Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait\n\nWhile performing fast composition switch, there is a possibility that the\nprocess of ffs_ep0_write/ffs_ep0_read get into a race condition\ndue to ep0req being freed up from functionfs_unbind.\n\nConsider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait\nby taking a lock \u0026ffs-\u003eev.waitq.lock. However, the functionfs_unbind isn\u0027t\nbounded so it can go ahead and mark the ep0req to NULL, and since there\nis no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.\n\nFix this by making a serialized execution between the two functions using\na mutex_lock(ffs-\u003emutex).",
  "id": "GHSA-qc5x-h4r4-86f3",
  "modified": "2025-03-28T18:33:11Z",
  "published": "2025-03-27T18:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49755"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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