Vulnerability-Lookup

GHSA-GJHH-5F46-FFH6

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64327"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:14Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-gjhh-5f46-ffh6",
  "modified": "2026-07-25T12:31:31Z",
  "published": "2026-07-25T12:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64327"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64327 (GCVE-0-2026-64327)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49

Title

usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks

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.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/82cf1142e5ccf2b6d…
https://git.kernel.org/stable/c/9e04055ab5fc0470a…
https://git.kernel.org/stable/c/f99f32ea9aa976afc…
https://git.kernel.org/stable/c/82cfd4739011bdc7e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7b07a2a7ca02a20124b552be96c5a56910795488 , < 82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b (git) Affected: 7b07a2a7ca02a20124b552be96c5a56910795488 , < 9e04055ab5fc0470a0031ee6934739f9aa8f34a5 (git) Affected: 7b07a2a7ca02a20124b552be96c5a56910795488 , < f99f32ea9aa976afcbec20647ed33b50a52002c1 (git) Affected: 7b07a2a7ca02a20124b552be96c5a56910795488 , < 82cfd4739011bdc7e87b5d585703427e89ddfaa5 (git)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_fs.c"
          ],
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          "vendor": "Linux",
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              "versionType": "semver"
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      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:49:55.426Z",
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    "cveId": "CVE-2026-64327",
    "datePublished": "2026-07-25T08:49:55.426Z",
    "dateReserved": "2026-07-19T15:36:31.780Z",
    "dateUpdated": "2026-07-25T08:49:55.426Z",
    "state": "PUBLISHED"
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}

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

GHSA-GJHH-5F46-FFH6

CVE-2026-64327 (GCVE-0-2026-64327)

Tags

Sightings

Nomenclature