Not yet scoredPublished Dec 7, 2025

CVE-2025-40315usb: gadget: f_fs: Fix epfile null pointer access after ep enable.

Updated under an hour ago (Oct 27, 2026, 2:30 PM ET)

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Exploited in the last 30 days

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

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: May 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c9fc422c9a43e3d58d246334a71f3390401781dc before b00d2572c16e8e59e979960d3383c2ae9cebd195; 0042178a69eb77a979e36a50dcce9794a3140ef8 builds before 1c0dbd240be3f87cac321b14e17979b7e9cb6a8f; 72a8aee863af099d4434314c4536d6c9a61dcf3c builds before 9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272; from ebe2b1add1055b903e2acd86b290a85297edc0b3 before c53e90563bc148e4e0ad09fe130ba2246d426ea6; from ebe2b1add1055b903e2acd86b290a85297edc0b3 before fc1141a530dfc91f0ee19b7f422a2d24829584bc; from ebe2b1add1055b903e2acd86b290a85297edc0b3 before d62b808d5c68a931ad0849a00a5e3be3dd7e0019; from ebe2b1add1055b903e2acd86b290a85297edc0b3 before 30880e9df27332403dd638a82c27921134b3630b; from ebe2b1add1055b903e2acd86b290a85297edc0b3 before cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4; and 9 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/b00d2572c16e8e59e979960d3383c2ae9cebd195
https://git.kernel.org/stable/c/1c0dbd240be3f87cac321b14e17979b7e9cb6a8f
https://git.kernel.org/stable/c/9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272
https://git.kernel.org/stable/c/c53e90563bc148e4e0ad09fe130ba2246d426ea6
https://git.kernel.org/stable/c/fc1141a530dfc91f0ee19b7f422a2d24829584bc
https://git.kernel.org/stable/c/d62b808d5c68a931ad0849a00a5e3be3dd7e0019
https://git.kernel.org/stable/c/30880e9df27332403dd638a82c27921134b3630b
https://git.kernel.org/stable/c/cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.