266 lines
16 KiB
JSON
266 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64583",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.798Z",
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"datePublished": "2026-08-06T07:06:25.335Z",
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"dateUpdated": "2026-08-23T12:45:42.500Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-23T12:45:42.500Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/udc/bdc/bdc_core.c",
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"drivers/usb/gadget/udc/bdc/bdc_udc.c"
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],
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"versions": [
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "eac1107e54679db2df2c36d8bba3b66d3ab6cbcd",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "0b0b76e31b3991a899ae724eb97d359de0c0f1b1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "3fe181952b8a1aeb167d4503c794c0f5050f08ed",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "f6fc21ec7ccd83726ba766d73d0b8cc03e726475",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "dcf3e2f164435b5844706cb8eefef29ebee0eedb",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "d4964a74717107697999f48bcb4e80a9c0679a27",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "efed421a94e62a7ddbc76acba4312b70e4be958f",
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"lessThan": "0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/udc/bdc/bdc_core.c",
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"drivers/usb/gadget/udc/bdc/bdc_udc.c"
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],
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"versions": [
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{
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"version": "3.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.266",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.183",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.101",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.42",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.19",
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"versionEndExcluding": "5.10.266"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.19",
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.19",
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"versionEndExcluding": "6.1.183"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.19",
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"versionEndExcluding": "6.6.148"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.19",
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"versionEndExcluding": "6.12.101"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "6.18.42"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.19",
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"versionEndExcluding": "7.1.6"
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},
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/eac1107e54679db2df2c36d8bba3b66d3ab6cbcd"
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},
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{
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"url": "https://git.kernel.org/stable/c/0b0b76e31b3991a899ae724eb97d359de0c0f1b1"
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},
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{
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"url": "https://git.kernel.org/stable/c/3fe181952b8a1aeb167d4503c794c0f5050f08ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8"
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},
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{
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"url": "https://git.kernel.org/stable/c/f6fc21ec7ccd83726ba766d73d0b8cc03e726475"
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},
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{
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"url": "https://git.kernel.org/stable/c/dcf3e2f164435b5844706cb8eefef29ebee0eedb"
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},
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{
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"url": "https://git.kernel.org/stable/c/d4964a74717107697999f48bcb4e80a9c0679a27"
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},
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{
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"url": "https://git.kernel.org/stable/c/0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb"
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}
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],
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"title": "usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |