CVE-2025-40315

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc9fc422c9a43e3d58d246334a71f3390401781dc < b00d2572c16e8e59e979960d3383c2ae9cebd195affected
LinuxLinux0042178a69eb77a979e36a50dcce9794a3140ef8 < 1c0dbd240be3f87cac321b14e17979b7e9cb6a8faffected
LinuxLinux72a8aee863af099d4434314c4536d6c9a61dcf3c < 9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272affected
LinuxLinuxebe2b1add1055b903e2acd86b290a85297edc0b3 < c53e90563bc148e4e0ad09fe130ba2246d426ea6affected
LinuxLinuxebe2b1add1055b903e2acd86b290a85297edc0b3 < fc1141a530dfc91f0ee19b7f422a2d24829584bcaffected
LinuxLinuxebe2b1add1055b903e2acd86b290a85297edc0b3 < d62b808d5c68a931ad0849a00a5e3be3dd7e0019affected
LinuxLinuxebe2b1add1055b903e2acd86b290a85297edc0b3 < 30880e9df27332403dd638a82c27921134b3630baffected
LinuxLinuxebe2b1add1055b903e2acd86b290a85297edc0b3 < cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4affected
LinuxLinux32048f4be071f9a6966744243f1786f45bb22dc2affected
LinuxLinuxcfe5f6fd335d882bcc829a1c8a7d462a455c626eaffected
LinuxLinux3e078b18753669615301d946297bafd69294ad2caffected
LinuxLinux5.4.180 < 5.4.302affected
LinuxLinux5.10.101 < 5.10.247affected
LinuxLinux5.15.24 < 5.15.197affected
LinuxLinux4.14.267 < 4.15affected
LinuxLinux4.19.230 < 4.20affected
LinuxLinux5.16.10 < 5.17affected
LinuxLinux5.17affected
LinuxLinux0 < 5.17unaffected
LinuxLinux5.4.302 <= 5.4.*unaffected
LinuxLinux5.10.247 <= 5.10.*unaffected
LinuxLinux5.15.197 <= 5.15.*unaffected
LinuxLinux6.1.159 <= 6.1.*unaffected
LinuxLinux6.6.117 <= 6.6.*unaffected
LinuxLinux6.12.58 <= 6.12.*unaffected
LinuxLinux6.17.8 <= 6.17.*unaffected
LinuxLinux6.18 <= *unaffected

Weaknesses

References