{"id":"CVE-2026-64346","summary":"usb: gadget: udc: Fix use-after-free in gadget_match_driver","details":"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 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.","modified":"2026-07-28T04:03:04.735055840Z","published":"2026-07-25T08:50:07.680Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64346.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64346.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64346"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4"},{"fixed":"50eeb8e8a4f389efc91b93cff14a683e714ec194"},{"fixed":"7a5214dae906d9f58e07bc4995e8181ee74439f4"},{"fixed":"d026f71df141c9b064ff32a78af5391a31ef75c2"},{"fixed":"b52476a83d9e12df00765359d728a875b128bef1"},{"fixed":"54fa390aae393eb130f307a85562e3001cc39a52"},{"fixed":"67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64346.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.19.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64346.json"}}],"schema_version":"1.7.5"}