Answer in brief
CVE-2025-40094 records a Unknown severity vulnerability in usb: gadget: f_acm: Refactor bind path to use __free(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <c5d116862dd3ed162d079738a5ebddf9fceea850 || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <2b1546f7c5fc6c44555a8e7a2b34229d1dcd2175 || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <e348d18fb0124b662cfefb3001733b49da428215 || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <201a66d8e6630762e760e1d78f1d149da1691e7b || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <c4301e4dd6b32faccb744f1c2320e64235b68d3b || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <47b2116e54b4a854600341487e8b55249e926324 | c5d116862dd3ed162d079738a5ebddf9fceea850, 2b1546f7c5fc6c44555a8e7a2b34229d1dcd2175, e348d18fb0124b662cfefb3001733b49da428215, 201a66d8e6630762e760e1d78f1d149da1691e7b, c4301e4dd6b32faccb744f1c2320e64235b68d3b, 47b2116e54b4a854600341487e8b55249e926324 |
| Linux/Linuxgeneric | 2.6.27 | Not reported |
Published upstream
Oct 30, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_acm: Refactor bind path to use __free() After an bind/unbind cycle, the acm->notify_req is left stale. If a subsequent bind fails, the unified error label attempts to free this stale request, leading to a NULL pointer dereference when accessing ep->ops->free_request. Refactor the error handling in the bind path to use the __free() automatic cleanup mechanism. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 Call trace: usb_ep_free_request+0x2c/0xec gs_free_req+0x30/0x44 acm_bind+0x1b8/0x1f4 usb_add_function+0xcc/0x1f0 configfs_composite_bind+0x468/0x588 gadget_bind_driver+0x104/0x270 really_probe+0x190/0x374 __driver_probe_device+0xa0/0x12c driver_probe_device+0x3c/0x218 __device_attach_driver+0x14c/0x188 bus_for_each_drv+0x10c/0x168 __device_attach+0xfc/0x198 device_initial_probe+0x14/0x24 bus_probe_device+0x94/0x11c device_add+0x268/0x48c usb_add_gadget+0x198/0x28c dwc3_gadget_init+0x700/0x858 __dwc3_set_mode+0x3cc/0x664 process_scheduled_works+0x1d8/0x488 worker_thread+0x244/0x334 kthread+0x114/0x1bc ret_from_fork+0x10/0x20
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-40094 records a Unknown severity vulnerability in usb: gadget: f_acm: Refactor bind path to use __free(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <c5d116862dd3ed162d079738a5ebddf9fceea850 || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <2b1546f7c5fc6c44555a8e7a2b34229d1dcd2175 || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <e348d18fb0124b662cfefb3001733b49da428215 || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <201a66d8e6630762e760e1d78f1d149da1691e7b || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <c4301e4dd6b32faccb744f1c2320e64235b68d3b || >=1f1ba11b64947051fc32aa15fcccef6463b433f7 <47b2116e54b4a854600341487e8b55249e926324 | c5d116862dd3ed162d079738a5ebddf9fceea850, 2b1546f7c5fc6c44555a8e7a2b34229d1dcd2175, e348d18fb0124b662cfefb3001733b49da428215, 201a66d8e6630762e760e1d78f1d149da1691e7b, c4301e4dd6b32faccb744f1c2320e64235b68d3b, 47b2116e54b4a854600341487e8b55249e926324 |
| Linux/Linuxgeneric | 2.6.27 | Not reported |
Published upstream
Oct 30, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_acm: Refactor bind path to use __free() After an bind/unbind cycle, the acm->notify_req is left stale. If a subsequent bind fails, the unified error label attempts to free this stale request, leading to a NULL pointer dereference when accessing ep->ops->free_request. Refactor the error handling in the bind path to use the __free() automatic cleanup mechanism. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 Call trace: usb_ep_free_request+0x2c/0xec gs_free_req+0x30/0x44 acm_bind+0x1b8/0x1f4 usb_add_function+0xcc/0x1f0 configfs_composite_bind+0x468/0x588 gadget_bind_driver+0x104/0x270 really_probe+0x190/0x374 __driver_probe_device+0xa0/0x12c driver_probe_device+0x3c/0x218 __device_attach_driver+0x14c/0x188 bus_for_each_drv+0x10c/0x168 __device_attach+0xfc/0x198 device_initial_probe+0x14/0x24 bus_probe_device+0x94/0x11c device_add+0x268/0x48c usb_add_gadget+0x198/0x28c dwc3_gadget_init+0x700/0x858 __dwc3_set_mode+0x3cc/0x664 process_scheduled_works+0x1d8/0x488 worker_thread+0x244/0x334 kthread+0x114/0x1bc ret_from_fork+0x10/0x20
Quoted source text, attributed separately from HOL analysis.