{"id":"CVE-2026-64346","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: Fix use-after-free in gadget_match_driver\n\nThe udc structure acts as the management structure for the gadget,\nbut their lifecycles are decoupled","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: Fix use-after-free in gadget_match_driver\n\nThe udc structure acts as the management structure for the gadget,\nbut their lifecycles are decoupled. A ra…","severity":"none","published":"2026-07-25","updated":"2026-07-27","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64346","references":[{"url":"https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00164,"epssPercentile":0.06011,"ingestedAt":"2026-07-27T06:16:50.631Z","slug":"CVE-2026-64346","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: Fix use-after-free in gadget_match_driver\n\nThe udc structure acts as the management structure for the gadget,\nbut their lifecycles are decoupled. A race condition exists where\nusb_del_gadget() frees the udc memory (e.g., via mode-switch work)\nwhile gadget_match_driver() concurrently accesses the freed udc memory\n(e.g., via configfs), causing a Use-After-Free (UAF) that triggers a\nNULL pointer dereference when the freed memory is zeroed:\n\n[39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n[39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140\n[39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60\n...\n[39430.911890][ T1171]  usb_gadget_register_driver_owner+0x50/0xf8\n[39430.911910][ T1171]  gadget_dev_desc_UDC_store+0xf4/0x140\n[39430.931308][ T1171]  configfs_write_iter+0xec/0x134\n\n[39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode\n[39430.957287][ T1171]  dwc3_gadget_exit+0x34/0x8c\n[39430.957304][ T1171]  __dwc3_set_mode+0xc0/0x664\n\nFix this by ensuring the udc structure remains allocated until the\ngadget is released. To achieve this, introduce a new\nusb_gadget_release() routine to the core. When the gadget is added,\nusb_add_gadget() stores the gadget's release routine in the udc\nstructure and takes a reference to the udc. When the gadget is\nreleased, usb_gadget_release() drops the reference to the udc and\nthen calls the gadget's release routine.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}