{ "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" } } } }