{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64583","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.798Z","datePublished":"2026-08-06T07:06:25.335Z","dateUpdated":"2026-08-23T12:45:42.500Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-23T12:45:42.500Z"},"descriptions":[{"lang":"en","value":"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() ->\nbdc_mem_free() manually before returning: bdc_udc_exit() tears down\nindividual endpoint objects via bdc_free_ep(), while bdc_hw_exit() ->\nbdc_mem_free() frees and NULLs the DMA-coherent status-report ring\n(bdc->srr.sr_bds) and kfree()s bdc->bdc_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->srr.sr_bds[bdc->srr.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->func_wake_notify, which is\narmed from the IRQ handler via bdc_sr_uspc() -> handle_link_state_change()\n-> 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->irq, 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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable window opens on local BDC platform-driver teardown (sysfs unbind/rmmod → bdc_remove), not on parsing USB host packets; that matches other USB gadget/UDC teardown UAFs scored AV:L and is higher severity than Physical.\nAC:L - The attacker controls remove/bind retries; a pending func_wake_notify (never cancelled before the fix) runs deterministically on the post-remove freed bdc, and IRQF_SHARED plus USB activity can also hit the IRQ window during teardown.\nPR:L - Highest reasonable exposure is a local account managing the gadget/UDC on Android or Broadcom STB systems where platform unbind is delegated beyond init-namespace root; uncertain Low vs High, so Low per the overestimate rule.\nUI:N - The attacker performs driver remove and any prior link-state activity that arms func_wake_notify themselves; no separate victim mount, open, or other interaction is required.\nS:U - NULL-deref/use-after-free of sr_bds, bdc_ep_array, and the delayed-work bdc object stays inside the host kernel authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free of the DMA status-report ring, endpoint array, and the bdc object via IRQ/work handlers allows reclaim/spray and disclosure of kernel memory, which per UAF guidance is High.\nI:H - The same UAF paths write through freed endpoint/status structures and run delayed work on a freed bdc, enabling heap corruption and control-flow hijack suitable for privilege escalation.\nA:H - Dereferencing NULL/freed sr_bds in hard-IRQ context or executing bdc_func_wake_timer on a post-remove freed bdc causes kernel oops/panic, so availability impact is High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/udc/bdc/bdc_core.c","drivers/usb/gadget/udc/bdc/bdc_udc.c"],"versions":[{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"eac1107e54679db2df2c36d8bba3b66d3ab6cbcd","status":"affected","versionType":"git"},{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"0b0b76e31b3991a899ae724eb97d359de0c0f1b1","status":"affected","versionType":"git"},{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"3fe181952b8a1aeb167d4503c794c0f5050f08ed","status":"affected","versionType":"git"},{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8","status":"affected","versionType":"git"},{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"f6fc21ec7ccd83726ba766d73d0b8cc03e726475","status":"affected","versionType":"git"},{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"dcf3e2f164435b5844706cb8eefef29ebee0eedb","status":"affected","versionType":"git"},{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"d4964a74717107697999f48bcb4e80a9c0679a27","status":"affected","versionType":"git"},{"version":"efed421a94e62a7ddbc76acba4312b70e4be958f","lessThan":"0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/udc/bdc/bdc_core.c","drivers/usb/gadget/udc/bdc/bdc_udc.c"],"versions":[{"version":"3.19","status":"affected"},{"version":"0","lessThan":"3.19","status":"unaffected","versionType":"semver"},{"version":"5.10.266","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.148","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/eac1107e54679db2df2c36d8bba3b66d3ab6cbcd"},{"url":"https://git.kernel.org/stable/c/0b0b76e31b3991a899ae724eb97d359de0c0f1b1"},{"url":"https://git.kernel.org/stable/c/3fe181952b8a1aeb167d4503c794c0f5050f08ed"},{"url":"https://git.kernel.org/stable/c/1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8"},{"url":"https://git.kernel.org/stable/c/f6fc21ec7ccd83726ba766d73d0b8cc03e726475"},{"url":"https://git.kernel.org/stable/c/dcf3e2f164435b5844706cb8eefef29ebee0eedb"},{"url":"https://git.kernel.org/stable/c/d4964a74717107697999f48bcb4e80a9c0679a27"},{"url":"https://git.kernel.org/stable/c/0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb"}],"title":"usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown","x_generator":{"engine":"bippy-1.2.0"}}}}