{"id":"CVE-2026-64583","summary":"usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown\n\nThe Broadcom BDC UDC driver registers its IRQ handler with\ndevm_request_irq() in bdc_udc_init(), so the IRQ is released by devm\nonly after bdc_remove() returns.  devm releases resources in reverse\nLIFO order, but bdc_remove() runs bdc_udc_exit() and bdc_hw_exit() -\u003e\nbdc_mem_free() manually before returning: bdc_udc_exit() tears down\nindividual endpoint objects via bdc_free_ep(), while bdc_hw_exit() -\u003e\nbdc_mem_free() frees and NULLs the DMA-coherent status-report ring\n(bdc-\u003esrr.sr_bds) and kfree()s bdc-\u003ebdc_ep_array.  Both happen while\nthe IRQ handler (bdc_udc_interrupt, requested with IRQF_SHARED)\nremains deliverable in the window up to the post-remove devm\nfree_irq().\n\nOn receipt of a shared interrupt in that window, bdc_udc_interrupt()\ndereferences bdc-\u003esrr.sr_bds[bdc-\u003esrr.dqp_index] (NULL or freed DMA)\nand dispatches sr_handler callbacks that index into bdc_ep_array,\ncausing a NULL-deref or use-after-free.\n\nThe same window affects the delayed_work bdc-\u003efunc_wake_notify, which is\narmed from the IRQ handler via bdc_sr_uspc() -\u003e handle_link_state_change()\n-\u003e schedule_delayed_work() and may self-rearm from its own callback\nbdc_func_wake_timer().  No cancel exists anywhere in the driver, so a\nqueued work item that fires after bdc_remove() returns and the bdc\nstructure is devm-freed dereferences freed memory.\n\nReplace devm_request_irq() with request_irq() and add an explicit\nfree_irq(bdc-\u003eirq, bdc) in bdc_remove().  Clear BDC_GIE before\nfree_irq() to stop the device from asserting interrupts, then\nfree_irq() drains any in-flight handler, then cancel_delayed_work_sync()\ndrains the func_wake_notify delayed work.  This ordering ensures the\nIRQ handler and delayed work cannot interfere with the subsequent\nendpoint and DMA teardown in bdc_udc_exit() and bdc_hw_exit().  Wire the\nmatching free_irq() into the bdc_udc_init() error path so the IRQ is\nreleased on probe failure, and route the bdc_init_ep() failure through\nerr0 instead of returning directly.\n\nThis issue was found by an in-house static analysis tool.","modified":"2026-08-10T08:27:12.062197424Z","published":"2026-08-06T07:06:25.335Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64583.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d4964a74717107697999f48bcb4e80a9c0679a27"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dcf3e2f164435b5844706cb8eefef29ebee0eedb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f6fc21ec7ccd83726ba766d73d0b8cc03e726475"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64583.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64583"},{"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":"efed421a94e62a7ddbc76acba4312b70e4be958f"},{"fixed":"1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8"},{"fixed":"f6fc21ec7ccd83726ba766d73d0b8cc03e726475"},{"fixed":"dcf3e2f164435b5844706cb8eefef29ebee0eedb"},{"fixed":"d4964a74717107697999f48bcb4e80a9c0679a27"},{"fixed":"0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64583.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.19.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64583.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}