222 lines
13 KiB
JSON
222 lines
13 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-2025-40092",
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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": "2025-04-16T07:20:57.163Z",
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"datePublished": "2025-10-30T09:47:59.910Z",
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"dateUpdated": "2026-08-05T12:07:43.366Z"
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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": "2026-08-05T12:07:43.366Z"
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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: f_ncm: Refactor bind path to use __free()\n\nAfter an bind/unbind cycle, the ncm->notify_req is left stale. If a\nsubsequent bind fails, the unified error label attempts to free this\nstale request, leading to a NULL pointer dereference when accessing\nep->ops->free_request.\n\nRefactor the error handling in the bind path to use the __free()\nautomatic cleanup mechanism.\n\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000020\nCall trace:\n usb_ep_free_request+0x2c/0xec\n ncm_bind+0x39c/0x3dc\n usb_add_function+0xcc/0x1f0\n configfs_composite_bind+0x468/0x588\n gadget_bind_driver+0x104/0x270\n really_probe+0x190/0x374\n __driver_probe_device+0xa0/0x12c\n driver_probe_device+0x3c/0x218\n __device_attach_driver+0x14c/0x188\n bus_for_each_drv+0x10c/0x168\n __device_attach+0xfc/0x198\n device_initial_probe+0x14/0x24\n bus_probe_device+0x94/0x11c\n device_add+0x268/0x48c\n usb_add_gadget+0x198/0x28c\n dwc3_gadget_init+0x700/0x858\n __dwc3_set_mode+0x3cc/0x664\n process_scheduled_works+0x1d8/0x488\n worker_thread+0x244/0x334\n kthread+0x114/0x1bc\n ret_from_fork+0x10/0x20"
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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 entire bind → unbind → failing-rebind sequence that dereferences the stale `ncm->notify_req` is driven by local writes to `/sys/kernel/config/usb_gadget/<g>/UDC` and function/config symlinks; no USB host traffic, cable event, or physical port access is required since any UDC (including dummy_hcd) suffices.\nAC:L - The attacker deterministically controls each step — the first successful `ncm_bind()`, the `purge_configs_funcs()`/unbind that leaves `ncm->notify_req` and `ncm->notify` dangling, and the forced failure of the next bind by exhausting `usb_interface_id()` (MAX_CONFIG_INTERFACES) or `usb_ep_autoconfig()` with extra functions linked in between cycles — plus the heap spray reclaiming the freed `usb_request`. No race or condition outside attacker control is involved.\nPR:L - `gadget_dev_desc_UDC_store()` and `ncm_bind()` perform no capability check whatsoever; access is gated only by configfs file permissions, and on Android and embedded/industrial systems the USB gadget configfs tree is routinely delegated to non-root system/daemon accounts that switch tethering (NCM/ECM/RNDIS) functions.\nUI:N - The attacker performs all configfs writes itself; no victim action, cable plug/unplug, or interaction with another user is needed to reach the stale free.\nS:U - The dangling-pointer free and resulting heap corruption remain within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `kfree(ncm->notify_req->buf)` reads a pointer out of the reclaimed `usb_request` (e.g. `dummy_request`/`dwc3_request`) slab object and `usb_ep_free_request()` reads `ep->ops` from a potentially freed `struct usb_ep`, so an attacker grooming those generic kmalloc caches gains object-overlap and arbitrary-free primitives readily converted into kernel memory disclosure.\nI:H - `kfree()` of an attacker-controlled pointer read from the freed request, a double free of the `usb_request` itself, and an indirect call through a reclaimable `ep->ops` table together yield classic heap-corruption primitives leading to arbitrary write and privilege escalation.\nA:H - The directly observed effect is a kernel oops — NULL/garbage `ep->ops` dereference in `usb_ep_free_request()` per the reported call trace — and the double free independently causes slab corruption and panic, repeatable at will by whoever holds the configfs tree."
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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/function/f_ncm.c"
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],
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"versions": [
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{
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"version": "9f6ce4240a2bf456402c15c06768059e5973f28c",
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"lessThan": "185193a4714aa9c78437a7a1858fbe5771f0f45c",
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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": "9f6ce4240a2bf456402c15c06768059e5973f28c",
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"lessThan": "f37de8dec6a4c379b4b8486003a1de00ff8cff3b",
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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": "9f6ce4240a2bf456402c15c06768059e5973f28c",
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"lessThan": "1cde4516295a030cb8ab4c93114ca3b6c3c6a1e2",
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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": "9f6ce4240a2bf456402c15c06768059e5973f28c",
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"lessThan": "d3fe7143928d8dfa2ec7bac9f906b48bc75b98ee",
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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": "9f6ce4240a2bf456402c15c06768059e5973f28c",
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"lessThan": "ed78f4d6079d872432b1ed54f155ef61965d3137",
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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": "9f6ce4240a2bf456402c15c06768059e5973f28c",
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"lessThan": "75a5b8d4ddd4eb6b16cb0b475d14ff4ae64295ef",
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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/function/f_ncm.c"
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],
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"versions": [
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{
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"version": "2.6.38",
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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": "2.6.38",
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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": "5.15.196",
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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": "6.1.158",
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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": "6.6.114",
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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": "6.12.55",
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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": "6.17.5",
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"lessThanOrEqual": "6.17.*",
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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",
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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": "2.6.38",
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"versionEndExcluding": "5.15.196"
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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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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/185193a4714aa9c78437a7a1858fbe5771f0f45c"
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},
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{
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"url": "https://git.kernel.org/stable/c/f37de8dec6a4c379b4b8486003a1de00ff8cff3b"
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},
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{
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"url": "https://git.kernel.org/stable/c/1cde4516295a030cb8ab4c93114ca3b6c3c6a1e2"
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},
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{
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"url": "https://git.kernel.org/stable/c/d3fe7143928d8dfa2ec7bac9f906b48bc75b98ee"
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},
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{
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"url": "https://git.kernel.org/stable/c/ed78f4d6079d872432b1ed54f155ef61965d3137"
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},
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{
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"url": "https://git.kernel.org/stable/c/75a5b8d4ddd4eb6b16cb0b475d14ff4ae64295ef"
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}
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],
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"title": "usb: gadget: f_ncm: Refactor bind path to use __free()",
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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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} |