CVE-2026-64327 (GCVE-0-2026-64327)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks When parsing endpoint descriptors, ffs_data_got_descs() generates the eps_addrmap which contains the endpoint direction. However, epfile->in was previously only populated in ffs_func_eps_enable() which executes upon USB host connection. As a result, early userspace ioctls like FUNCTIONFS_DMABUF_ATTACH that run before the host connects would see epfile->in as 0, leading to incorrect DMA directions. By moving the initialization to ffs_epfiles_create(), epfile->in is accurate before userspace opens the endpoint files.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7b07a2a7ca02a20124b552be96c5a56910795488
Version: 7b07a2a7ca02a20124b552be96c5a56910795488
Version: 7b07a2a7ca02a20124b552be96c5a56910795488
Version: 7b07a2a7ca02a20124b552be96c5a56910795488
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_fs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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      "cpeApplicability": [
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                  "vulnerable": true
                },
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Initialize epfile-\u003ein early to fix endpoint direction checks\n\nWhen parsing endpoint descriptors, ffs_data_got_descs() generates the\neps_addrmap which contains the endpoint direction. However, epfile-\u003ein\nwas previously only populated in ffs_func_eps_enable() which executes\nupon USB host connection. As a result, early userspace ioctls like\nFUNCTIONFS_DMABUF_ATTACH that run before the host connects would see\nepfile-\u003ein as 0, leading to incorrect DMA directions.\n\nBy moving the initialization to ffs_epfiles_create(), epfile-\u003ein is\naccurate before userspace opens the endpoint files."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:53:29.409Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5"
        }
      ],
      "title": "usb: gadget: f_fs: Initialize epfile-\u003ein early to fix endpoint direction checks",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64327",
    "datePublished": "2026-07-25T08:49:55.426Z",
    "dateReserved": "2026-07-19T15:36:31.780Z",
    "dateUpdated": "2026-08-17T04:53:29.409Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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