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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。ux是Symfony开源的一个Symfony的JavaScript生态系统。 Linux kernel存在安全漏洞，该漏洞源于竞态条件，可能导致空指针取消引用。

AI Predicted 4.9 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 27

VendorProduct Version RangeStatus
Linux Linux c9fc422c9a43e3d58d246334a71f3390401781dc< b00d2572c16e8e59e979960d3383c2ae9cebd195 affected
0042178a69eb77a979e36a50dcce9794a3140ef8< 1c0dbd240be3f87cac321b14e17979b7e9cb6a8f affected
72a8aee863af099d4434314c4536d6c9a61dcf3c< 9ec40fba7357df2d36f4c2e2f3b9b1a4fba0a272 affected
ebe2b1add1055b903e2acd86b290a85297edc0b3< c53e90563bc148e4e0ad09fe130ba2246d426ea6 affected
ebe2b1add1055b903e2acd86b290a85297edc0b3< fc1141a530dfc91f0ee19b7f422a2d24829584bc affected
ebe2b1add1055b903e2acd86b290a85297edc0b3< d62b808d5c68a931ad0849a00a5e3be3dd7e0019 affected
ebe2b1add1055b903e2acd86b290a85297edc0b3< 30880e9df27332403dd638a82c27921134b3630b affected
ebe2b1add1055b903e2acd86b290a85297edc0b3< cfd6f1a7b42f62523c96d9703ef32b0dbc495ba4 affected
… +19 more rows
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I. Basic Information for CVE-2025-40315

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
usb: gadget: f_fs: Fix epfile null pointer access after ep enable.
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。ux是Symfony开源的一个Symfony的JavaScript生态系统。 Linux kernel存在安全漏洞，该漏洞源于竞态条件，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c9fc422c9a43e3d58d246334a71f3390401781dc ~ b00d2572c16e8e59e979960d3383c2ae9cebd195 -
Linux Linux 5.17 -

II. Public POCs for CVE-2025-40315

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III. Intelligence Information for CVE-2025-40315

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Same Patch Batch · Linux · 2025-12-08 · 82 CVEs total

CVE-2023-53751 9.8 CRITICAL cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname
CVE-2025-40320 9.8 CRITICAL smb: client: fix potential cfid UAF in smb2_query_info_compound
CVE-2023-53769 9.3 CRITICAL virt/coco/sev-guest: Double-buffer messages
CVE-2023-53764 8.8 HIGH wifi: ath12k: Handle lock during peer_id find
CVE-2023-53762 8.8 HIGH Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync
CVE-2025-40318 8.8 HIGH Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once
CVE-2025-40292 8.4 HIGH virtio-net: fix received length check in big packets
CVE-2025-40309 8.0 HIGH Bluetooth: SCO: Fix UAF on sco_conn_free
CVE-2025-40297 7.8 HIGH net: bridge: fix use-after-free due to MST port state bypass
CVE-2025-40317 7.8 HIGH regmap: slimbus: fix bus_context pointer in regmap init calls
CVE-2025-40302 7.8 HIGH media: videobuf2: forbid remove_bufs when legacy fileio is active
CVE-2023-53763 7.8 HIGH Revert "f2fs: fix to do sanity check on extent cache correctly"
CVE-2023-53759 7.8 HIGH HID: hidraw: fix data race on device refcount
CVE-2025-40319 7.8 HIGH bpf: Sync pending IRQ work before freeing ring buffer
CVE-2025-40323 7.8 HIGH fbcon: Set fb_display[i]->mode to NULL when the mode is released
CVE-2023-53753 7.8 HIGH drm/amd/display: fix mapping to non-allocated address
CVE-2023-53752 7.8 HIGH net: deal with integer overflows in kmalloc_reserve()
CVE-2023-53747 7.8 HIGH vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF
CVE-2022-50623 7.8 HIGH fpga: prevent integer overflow in dfl_feature_ioctl_set_irq()
CVE-2022-50630 7.8 HIGH mm: hugetlb: fix UAF in hugetlb_handle_userfault

Showing top 20 of 82 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40315

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