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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
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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            "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"
          }
        ],
        "id": "CVE-2025-40315",
        "lastModified": "2026-06-17T09:21:38.720",
        "metrics": {},
        "published": "2025-12-08T01:16:04.013",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          {
            "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:47:47Z",
      "cve": "CVE-2025-40315",
      "id": "CVE-2025-40315",
      "initial_release_date": "2025-12-09T00:24:17Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "487",
      "product_status:known_not_affected": "342",
      "product_status:recommended": "384",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40315",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40315.json",
      "version": "37"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.