Vulnerability-Lookup

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)

Show details on NVD website

JSON

To clipboard

{
  "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": [
            {
              "lessThan": "82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b",
              "status": "affected",
              "version": "7b07a2a7ca02a20124b552be96c5a56910795488",
              "versionType": "git"
            },
            {
              "lessThan": "9e04055ab5fc0470a0031ee6934739f9aa8f34a5",
              "status": "affected",
              "version": "7b07a2a7ca02a20124b552be96c5a56910795488",
              "versionType": "git"
            },
            {
              "lessThan": "f99f32ea9aa976afcbec20647ed33b50a52002c1",
              "status": "affected",
              "version": "7b07a2a7ca02a20124b552be96c5a56910795488",
              "versionType": "git"
            },
            {
              "lessThan": "82cfd4739011bdc7e87b5d585703427e89ddfaa5",
              "status": "affected",
              "version": "7b07a2a7ca02a20124b552be96c5a56910795488",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc3",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-07-25T08:49:55.426Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64327",
      "date": "2026-07-26",
      "epss": "0.002",
      "percentile": "0.10112"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64327\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:14.327\",\"lastModified\":\"2026-07-25T10:17:14.327\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/function/f_fs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7b07a2a7ca02a20124b552be96c5a56910795488\",\"lessThan\":\"82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7b07a2a7ca02a20124b552be96c5a56910795488\",\"lessThan\":\"9e04055ab5fc0470a0031ee6934739f9aa8f34a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7b07a2a7ca02a20124b552be96c5a56910795488\",\"lessThan\":\"f99f32ea9aa976afcbec20647ed33b50a52002c1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7b07a2a7ca02a20124b552be96c5a56910795488\",\"lessThan\":\"82cfd4739011bdc7e87b5d585703427e89ddfaa5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/function/f_fs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:45:38Z",
      "cve": "CVE-2026-64327",
      "id": "CVE-2026-64327",
      "initial_release_date": "2026-07-25T16:45:38Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64327",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64327.json",
      "version": "2"
    }
  }
}

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.

Show details on source website

JSON

To clipboard

{
  "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": []
}

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

GHSA-GJHH-5F46-FFH6

Tags

Sightings

Nomenclature