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usb: gadget: f_fs: Fix epfile null pointer access after ep enable.

Type: advisorySources: OSV

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

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.247, 5.15.197, 5.4.302, 6.1.159, 6.12.58, 6.17.8, 6.6.117
CVEs
CVE-2025-40315
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 03:30 UTC · Revision 1

Source evidence

usb: gadget: f_fs: Fix epfile null pointer access after ep enable.

core-osv · Original source

Published 8 Dec 2025, 00:46 UTC

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

osv:CVE-2025-40315

Kernel

Fixed versions: 5.4.302, 5.10.247, 5.15.197, 6.1.159, 6.6.117, 6.12.58, 6.17.8

Complete source record
{
  "id": "3bcf9fa56ce08fe0abb28ae8d629835845fbdce290a153433b9425ef18e56142",
  "url": "https://osv.dev/vulnerability/CVE-2025-40315",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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",
    "evidence": "osv:CVE-2025-40315",
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      "provider": "osv",
      "references": [
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        "https://git.kernel.org/stable/c/30880e9df27332403dd638a82c27921134b3630b",
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        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40315.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40315",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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  "source_id": "core-osv",
  "document_id": 492200,
  "published_at": "2025-12-08T00:46:41.896+00:00"
}