184 lines
10 KiB
JSON
184 lines
10 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-2026-46036",
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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": "2026-05-13T15:03:33.093Z",
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"datePublished": "2026-05-27T12:56:46.381Z",
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"dateUpdated": "2026-08-05T12:29:15.525Z"
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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": "2026-08-05T12:29:15.525Z"
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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\nvfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex\n\nvfio_cdx_set_msi_trigger() reads vdev->config_msi and operates on the\nvdev->cdx_irqs array based on its value, but provides no serialization\nagainst concurrent VFIO_DEVICE_SET_IRQS ioctls. Two callers can race\nsuch that one observes config_msi as set while another clears it and\nfrees cdx_irqs via vfio_cdx_msi_disable(), resulting in a use-after-free\nof the cdx_irqs array.\n\nAdd a cdx_irqs_lock mutex to struct vfio_cdx_device and acquire it in\nvfio_cdx_set_msi_trigger(), which is the single chokepoint through\nwhich all updates to config_msi, cdx_irqs, and msi_count flow, covering\nboth the ioctl path and the close-device cleanup path. This keeps the\ntest of config_msi atomic with the subsequent enable, disable, or\ntrigger operations.\n\nDrop the pre-call !cdx_irqs test from vfio_cdx_irqs_cleanup() as part\nof this change: the optimization it provided is redundant with the\n!config_msi early-return inside vfio_cdx_msi_disable(), and leaving the\ntest in place would be an unsynchronized read of state the new lock is\nmeant to protect."
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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 bug is reached only via ioctl(VFIO_DEVICE_SET_IRQS) on a local /dev/vfio device file; there is no network or adjacent-network exposure.\nAC:L - This is an attacker-controlled race — the attacker issues concurrent enable/trigger and disable SET_IRQS ioctls from two threads on the same fd, controlling both sides, and the unserialized core dispatch lets them run in parallel and be hammered until won.\nPR:L - VFIO's threat model hands the device fd to unprivileged userspace (VM/passthrough processes), so an attacker only needs access to an already-bound vfio-cdx device fd, not init-namespace root; when uncertain, the higher-severity L is chosen.\nUI:N - Triggering the race requires only the attacker's own concurrent ioctls; no victim action is needed.\nS:U - The use-after-free corrupts the kernel's own cdx_irqs management array within the kernel security authority and does not cross an IOMMU/VM boundary.\nC:H - Use-after-free of a heap array whose freed contents are read back (including pointers) allows the attacker to reallocate the slab with controlled data and disclose kernel memory.\nI:H - The freed array's entries (a dereferenced/callable eventfd_ctx pointer and pointers passed to kfree/free_irq) enable heap-spray-based arbitrary write and control-flow hijacking.\nA:H - The use-after-free reliably causes kernel oops/panic when the freed cdx_irqs array is accessed."
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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/vfio/cdx/intr.c",
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"drivers/vfio/cdx/main.c",
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"drivers/vfio/cdx/private.h"
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],
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"versions": [
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{
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"version": "848e447e000c41894ff931dc7c004fd42c8840f8",
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"lessThan": "ddf96e23c366c566283fce8377928851fa7f5e81",
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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": "848e447e000c41894ff931dc7c004fd42c8840f8",
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"lessThan": "7b436ade16cc81095d79b79f8efa3af0a4f5c5a2",
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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": "848e447e000c41894ff931dc7c004fd42c8840f8",
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"lessThan": "7530f34ec0ca1438d45a75dcb43183a1cc92eced",
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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": "848e447e000c41894ff931dc7c004fd42c8840f8",
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"lessThan": "670e8864b1a218d72f08db40d0103adf38fa1d9b",
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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/vfio/cdx/intr.c",
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"drivers/vfio/cdx/main.c",
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"drivers/vfio/cdx/private.h"
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],
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"versions": [
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{
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"version": "6.10",
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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": "6.10",
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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": "6.12.86",
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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": "6.18.27",
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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": "7.0.4",
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"lessThanOrEqual": "7.0.*",
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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",
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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": "6.10",
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"versionEndExcluding": "6.12.86"
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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": "6.10",
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"versionEndExcluding": "6.18.27"
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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": "6.10",
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"versionEndExcluding": "7.0.4"
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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": "6.10",
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"versionEndExcluding": "7.1"
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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/ddf96e23c366c566283fce8377928851fa7f5e81"
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},
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{
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"url": "https://git.kernel.org/stable/c/7b436ade16cc81095d79b79f8efa3af0a4f5c5a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/7530f34ec0ca1438d45a75dcb43183a1cc92eced"
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},
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{
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"url": "https://git.kernel.org/stable/c/670e8864b1a218d72f08db40d0103adf38fa1d9b"
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}
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],
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"title": "vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex",
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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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} |