CVE-2025-40315 (GCVE-0-2025-40315)

Vulnerability from cvelistv5 – Published: 2025-12-08 00:46 – Updated: 2026-05-23 16:02
VLAI
Title
usb: gadget: f_fs: Fix epfile null pointer access after ep enable.
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix epfile null pointer access after ep enable. A race condition occurs when ffs_func_eps_enable() runs concurrently with ffs_data_reset(). The ffs_data_clear() called in ffs_data_reset() sets ffs->epfiles to NULL before resetting ffs->eps_count to 0, leading to a NULL pointer dereference when accessing epfile->ep in ffs_func_eps_enable() after successful usb_ep_enable(). The ffs->epfiles pointer is set to NULL in both ffs_data_clear() and ffs_data_close() functions, and its modification is protected by the spinlock ffs->eps_lock. And the whole ffs_func_eps_enable() function is also protected by ffs->eps_lock. Thus, add NULL pointer handling for ffs->epfiles in the ffs_func_eps_enable() function to fix issues
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c9fc422c9a43e3d58d246334a71f3390401781dc , < b00d2572c16e8e59e979960d3383c2ae9cebd195 (git)
Affected: 0042178a69eb77a979e36a50dcce9794a3140ef8 , < 1c0dbd240be3f87cac321b14e17979b7e9cb6a8f (git)
Affected: 72a8aee863af099d4434314c4536d6c9a61dcf3c , < 9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272 (git)
Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < c53e90563bc148e4e0ad09fe130ba2246d426ea6 (git)
Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < fc1141a530dfc91f0ee19b7f422a2d24829584bc (git)
Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < d62b808d5c68a931ad0849a00a5e3be3dd7e0019 (git)
Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < 30880e9df27332403dd638a82c27921134b3630b (git)
Affected: ebe2b1add1055b903e2acd86b290a85297edc0b3 , < cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4 (git)
Affected: 32048f4be071f9a6966744243f1786f45bb22dc2 (git)
Affected: cfe5f6fd335d882bcc829a1c8a7d462a455c626e (git)
Affected: 3e078b18753669615301d946297bafd69294ad2c (git)
Affected: 5.4.180 , < 5.4.302 (semver)
Affected: 5.10.101 , < 5.10.247 (semver)
Affected: 5.15.24 , < 5.15.197 (semver)
Affected: 4.14.267 , < 4.15 (semver)
Affected: 4.19.230 , < 4.20 (semver)
Affected: 5.16.10 , < 5.17 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix epfile null pointer access after ep enable.\n\nA race condition occurs when ffs_func_eps_enable() runs concurrently\nwith ffs_data_reset(). The ffs_data_clear() called in ffs_data_reset()\nsets ffs-\u003eepfiles to NULL before resetting ffs-\u003eeps_count to 0, leading\nto a NULL pointer dereference when accessing epfile-\u003eep in\nffs_func_eps_enable() after successful usb_ep_enable().\n\nThe ffs-\u003eepfiles pointer is set to NULL in both ffs_data_clear() and\nffs_data_close() functions, and its modification is protected by the\nspinlock ffs-\u003eeps_lock. And the whole ffs_func_eps_enable() function\nis also protected by ffs-\u003eeps_lock.\n\nThus, add NULL pointer handling for ffs-\u003eepfiles in the\nffs_func_eps_enable() function to fix issues"
        }
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        {
          "url": "https://git.kernel.org/stable/c/cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4"
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      "title": "usb: gadget: f_fs: Fix epfile null pointer access after ep enable.",
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        "engine": "bippy-1.2.0"
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    "cveId": "CVE-2025-40315",
    "datePublished": "2025-12-08T00:46:41.896Z",
    "dateReserved": "2025-04-16T07:20:57.186Z",
    "dateUpdated": "2026-05-23T16:02:03.665Z",
    "state": "PUBLISHED"
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      "date": "2026-10-31",
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      "cve": "CVE-2025-40315",
      "id": "msrc_CVE-2025-40315",
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      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: gadget: f_fs: Fix epfile null pointer access after ep enable.",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40315.json",
      "version": "1"
    },
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix epfile null pointer access after ep enable.\n\nA race condition occurs when ffs_func_eps_enable() runs concurrently\nwith ffs_data_reset(). The ffs_data_clear() called in ffs_data_reset()\nsets ffs-\u003eepfiles to NULL before resetting ffs-\u003eeps_count to 0, leading\nto a NULL pointer dereference when accessing epfile-\u003eep in\nffs_func_eps_enable() after successful usb_ep_enable().\n\nThe ffs-\u003eepfiles pointer is set to NULL in both ffs_data_clear() and\nffs_data_close() functions, and its modification is protected by the\nspinlock ffs-\u003eeps_lock. And the whole ffs_func_eps_enable() function\nis also protected by ffs-\u003eeps_lock.\n\nThus, add NULL pointer handling for ffs-\u003eepfiles in the\nffs_func_eps_enable() function to fix issues"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nusb: gadget: f_fs: Soluci\u00f3n al acceso a puntero nulo de epfile despu\u00e9s de la habilitaci\u00f3n de ep.\n\nUna condici\u00f3n de carrera ocurre cuando ffs_func_eps_enable() se ejecuta concurrentemente con ffs_data_reset(). La funci\u00f3n ffs_data_clear() llamada en ffs_data_reset() establece ffs -\u003e epfiles a NULL antes de restablecer ffs -\u003e eps_count a 0, lo que lleva a una desreferenciaci\u00f3n de puntero NULL al acceder a epfile -\u003e ep en ffs_func_eps_enable() despu\u00e9s de una usb_ep_enable() exitosa.\n\nEl puntero ffs -\u003e epfiles se establece a NULL tanto en las funciones ffs_data_clear() como ffs_data_close(), y su modificaci\u00f3n est\u00e1 protegida por el spinlock ffs -\u003e eps_lock. Y toda la funci\u00f3n ffs_func_eps_enable() tambi\u00e9n est\u00e1 protegida por ffs -\u003e eps_lock.\n\nPor lo tanto, se a\u00f1ade el manejo de punteros NULL para ffs -\u003e epfiles en la funci\u00f3n ffs_func_eps_enable() para solucionar los problemas."
          }
        ],
        "id": "CVE-2025-40315",
        "lastModified": "2026-10-14T22:10:00.210",
        "metrics": {},
        "published": "2025-12-08T01:16:04.013",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1c0dbd240be3f87cac321b14e17979b7e9cb6a8f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/30880e9df27332403dd638a82c27921134b3630b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b00d2572c16e8e59e979960d3383c2ae9cebd195"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c53e90563bc148e4e0ad09fe130ba2246d426ea6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d62b808d5c68a931ad0849a00a5e3be3dd7e0019"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fc1141a530dfc91f0ee19b7f422a2d24829584bc"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:34:35+00:00",
      "cve": "CVE-2025-40315",
      "id": "CVE-2025-40315",
      "initial_release_date": "2025-12-08T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: f_fs: Fix epfile null pointer access after ep enable",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40315.json",
      "version": "3"
    }
  }
}



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