201 lines
11 KiB
JSON
201 lines
11 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-2025-40093",
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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": "2025-10-30T09:48:00.807Z",
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"dateUpdated": "2026-08-05T12:07:44.429Z"
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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": "2026-08-05T12:07:44.429Z"
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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_ecm: Refactor bind path to use __free()\n\nAfter an bind/unbind cycle, the ecm->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."
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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/re-bind sequence that creates and then dereferences the stale `ecm->notify_req` is driven by local writes to `/sys/kernel/config/usb_gadget/<g>/UDC` and the function/config symlinks; no USB host traffic, cable event, or physical port access is required, so the bug is reachable purely through local filesystem/syscall access.\nAC:L - The attacker deterministically controls every step — the successful first bind, the unbind that leaves `ecm->notify_req`/`ecm->notify` dangling, and the forced failure of the next bind by exhausting `usb_interface_id()` (MAX_CONFIG_INTERFACES) or `usb_ep_autoconfig()` via extra functions linked into the config between cycles — plus the heap spray that reclaims the freed `usb_request`. No race or condition outside attacker control is involved.\nPR:L - `gadget_dev_desc_UDC_store()` and `ecm_bind()` perform no capability check at all; access is gated only by configfs file permissions, and on Android and embedded/industrial deployments the USB gadget configfs tree is routinely delegated to non-root system/daemon accounts that switch tethering (ECM/NCM/RNDIS) functions.\nUI:N - The attacker performs all configfs writes itself; no victim action, cable plug event, or interaction with another user is needed to reach the stale free.\nS:U - The dangling-pointer free and subsequent heap corruption stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `kfree(ecm->notify_req->buf)` reads a pointer out of the reclaimed `struct dummy_request`/`dwc3_request` slab and `usb_ep_free_request()` reads `ep->ops` out of a potentially freed `struct usb_ep`, so an attacker who grooms 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()` — and the double free independently causes slab corruption and panic, which an unprivileged holder of the configfs tree can trigger repeatedly."
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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_ecm.c"
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],
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"versions": [
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{
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"version": "da741b8c56d612b5dd26ffa31341911a5fea23ee",
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"lessThan": "d3745aaef19198d0c81637a7dd50ef53c4f879b7",
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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": "da741b8c56d612b5dd26ffa31341911a5fea23ee",
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"lessThan": "070f341d86cf2c098d63e484a86c7c1d2696a868",
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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": "da741b8c56d612b5dd26ffa31341911a5fea23ee",
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"lessThan": "15b9faf53ba8719700596e7ef78879ce200e8c2e",
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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": "da741b8c56d612b5dd26ffa31341911a5fea23ee",
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"lessThan": "4630c68bade82f087eaaab22e9a361da2f18d139",
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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": "da741b8c56d612b5dd26ffa31341911a5fea23ee",
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"lessThan": "42988380ac67c76bb9dff8f77d7ef3eefd50b7b5",
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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_ecm.c"
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],
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"versions": [
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{
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"version": "2.6.27",
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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": "2.6.27",
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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": "2.6.27",
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"versionEndExcluding": "6.1.158"
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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": "2.6.27",
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"versionEndExcluding": "6.6.114"
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"versionEndExcluding": "6.12.55"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.27",
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"versionEndExcluding": "6.17.5"
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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": "2.6.27",
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"versionEndExcluding": "6.18"
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}
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]
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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/d3745aaef19198d0c81637a7dd50ef53c4f879b7"
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},
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{
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"url": "https://git.kernel.org/stable/c/070f341d86cf2c098d63e484a86c7c1d2696a868"
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},
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{
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"url": "https://git.kernel.org/stable/c/15b9faf53ba8719700596e7ef78879ce200e8c2e"
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},
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{
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"url": "https://git.kernel.org/stable/c/4630c68bade82f087eaaab22e9a361da2f18d139"
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},
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{
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"url": "https://git.kernel.org/stable/c/42988380ac67c76bb9dff8f77d7ef3eefd50b7b5"
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}
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],
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"title": "usb: gadget: f_ecm: 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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}
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} |