Riskcovery

CVE-2025-40315

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

State
Published
Severity
Not scored
Published
Dec 8, 2025
Updated
May 23, 2026
Reserved
Apr 16, 2025

Read the record on cve.org

Description

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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • c9fc422c9a43e3d58d246334a71f3390401781dc to before b00d2572c16e8e59e979960d3383c2ae9cebd195Affected
  • 0042178a69eb77a979e36a50dcce9794a3140ef8 to before 1c0dbd240be3f87cac321b14e17979b7e9cb6a8fAffected
  • 72a8aee863af099d4434314c4536d6c9a61dcf3c to before 9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272Affected
  • ebe2b1add1055b903e2acd86b290a85297edc0b3 to before c53e90563bc148e4e0ad09fe130ba2246d426ea6Affected
  • ebe2b1add1055b903e2acd86b290a85297edc0b3 to before fc1141a530dfc91f0ee19b7f422a2d24829584bcAffected
  • ebe2b1add1055b903e2acd86b290a85297edc0b3 to before d62b808d5c68a931ad0849a00a5e3be3dd7e0019Affected
  • ebe2b1add1055b903e2acd86b290a85297edc0b3 to before 30880e9df27332403dd638a82c27921134b3630bAffected
  • ebe2b1add1055b903e2acd86b290a85297edc0b3 to before cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4Affected
  • 32048f4be071f9a6966744243f1786f45bb22dc2Affected
  • cfe5f6fd335d882bcc829a1c8a7d462a455c626eAffected
  • 3e078b18753669615301d946297bafd69294ad2cAffected
  • 5.4.180 to before 5.4.302Affected
  • 5.10.101 to before 5.10.247Affected
  • 5.15.24 to before 5.15.197Affected
  • 4.14.267 to before 4.15Affected
  • 4.19.230 to before 4.20Affected
  • 5.16.10 to before 5.17Affected
LinuxLinux
  • 5.17Affected
  • before 5.17Not affected
  • 5.4.302 through 5.4.*Not affected
  • 5.10.247 through 5.10.*Not affected
  • 5.15.197 through 5.15.*Not affected
  • 6.1.159 through 6.1.*Not affected
  • 6.6.117 through 6.6.*Not affected
  • 6.12.58 through 6.12.*Not affected
  • 6.17.8 through 6.17.*Not affected
  • 6.18 and laterNot affected

References

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