319 lines
17 KiB
JSON
319 lines
17 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-2026-74580",
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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": "2026-08-15T05:44:03.918Z",
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"datePublished": "2026-08-21T16:31:54.076Z",
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"dateUpdated": "2026-10-29T03:57:01.255Z"
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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": "2026-08-25T05:40:06.380Z"
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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\nvhost: reset the vring metadata cache on vring reconfiguration\n\nvq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring\nmetadata region, and iotlb_access_ok() returns early on a cache hit,\ntaking the hit as proof that the region has already been validated:\n\n\tif (vhost_vq_meta_fetch(vq, addr, len, type))\n\t\treturn true;\n\nThe cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on\ndevice IOTLB (re)initialisation and on vq reset, but not when\nVHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when\nVHOST_SET_VRING_NUM changes the region sizes.\n\nWith a device IOTLB attached both ioctls are accepted while the vq is\nlive, and neither validates the addresses at ioctl time: vq_access_ok()\nand vq_log_used_access_ok() return true early because the addresses are\nGIOVAs, deferring validation to prefetch time. Once the cache has been\npopulated that deferred validation no longer runs -- vq_meta_prefetch()\nhits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps\ntranslating through the old mapping as\n\n\tmap->addr + addr - map->start\n\nfor an address the mapping no longer covers. vhost_copy_to_user() and\nvhost_copy_from_user() consume the result with __copy_to_user() and\n__copy_from_user(), which do not check it either, so a subsequent used\nring update or descriptor fetch accesses memory outside the region the\nIOTLB actually maps.\n\nReset the metadata cache whenever the vring is reconfigured, so the new\naddresses are pushed back through iotlb_access_ok()'s slow path."
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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:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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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 - Exploitation requires ioctl on /dev/vhost-net or /dev/vhost-vsock (VHOST_SET_OWNER, VHOST_SET_FEATURES with VIRTIO_F_ACCESS_PLATFORM, VHOST_SET_VRING_ADDR, IOTLB updates); although virtio kicks and network I/O trigger the corrupting copies, the stale-cache state is created only through local vhost character-device syscalls, not remote packets.\nAC:L - An attacker who controls the vhost owner process can deterministically populate meta_iotlb via normal virtqueue traffic, issue VHOST_SET_VRING_ADDR with new GIOVAs while the backend is live, then trigger descriptor/used-ring access; no races, special heap layout, or victim timing are required.\nPR:L - No host root is needed: exploitation is performed by the vhost device owner (standard libvirt/QEMU kvm-group account) or, in the highest-impact cloud scenario, an authorized malicious VM tenant whose virtio traffic drives vhost workers after QEMU updates live vring addresses under VIRTIO_F_ACCESS_PLATFORM.\nUI:N - No end-user or administrator action is required beyond routine automated VM operation (virtio I/O, vhost backend attachment, and vring setup) that the attacker or tenant controls directly.\nS:C - Stale IOTLB metadata translation makes the host kernel read/write outside the mapped vring regions in the VMM userspace address space (QEMU), crossing the guest-to-host virtualization boundary—the same escape class as CVE-2025-38074, not mere in-guest kernel impact.\nC:H - vhost_copy_from_user and __vhost_get_user use vhost_vq_meta_fetch's stale map->addr+addr-map->start translation without bounds checks, enabling out-of-bounds reads of adjacent VMM memory during descriptor and avail-ring fetches (arbitrary misdirected kernel reads from host userspace).\nI:H - vhost_copy_to_user and vhost_put_user write used-ring entries through the same stale translation, giving controlled out-of-bounds writes into the VMM process that can corrupt QEMU heap, IOTLB tables, or migration metadata for code-execution primitives.\nA:H - Misdirected __copy_to_user/__copy_from_user against unmapped or invalid VMM addresses can fault the vhost worker (host kernel oops/panic), and corrupting VMM control structures reliably crashes or kills the hypervisor process, terminating the VM."
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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/vhost/vhost.c"
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],
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"versions": [
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{
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"version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "5224bd37e37d36076a550d99b2aebba33939fd95",
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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": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "54617e9119be2eb728ecdd8d977b99c99d4c498a",
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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": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "13fa6f32a56a386a82bd7451644c494beed034af",
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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": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7",
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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": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "6fa3e9b1fe856259555a7e22f3f3082e7827fd9b",
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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": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6",
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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": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "b70ebe0bba254e093dd5fd4c0c170941ce83eb85",
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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": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
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"lessThan": "de845981da67a6b049080c87e605130b0c30adc5",
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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/vhost/vhost.c"
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],
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"versions": [
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{
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"version": "4.11",
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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": "4.11",
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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": "5.10.265",
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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": "6.6.152",
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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": "6.12.104",
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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": "6.18.45",
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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": "7.1.9",
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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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"nodes": [
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"url": "https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a"
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},
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{
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{
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"url": "https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7"
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},
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{
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"url": "https://git.kernel.org/stable/c/6fa3e9b1fe856259555a7e22f3f3082e7827fd9b"
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{
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"url": "https://git.kernel.org/stable/c/b70ebe0bba254e093dd5fd4c0c170941ce83eb85"
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{
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"url": "https://git.kernel.org/stable/c/de845981da67a6b049080c87e605130b0c30adc5"
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}
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],
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"title": "vhost: reset the vring metadata cache on vring reconfiguration",
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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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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "http://www.openwall.com/lists/oss-security/2026/10/14/2"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2026-10-14T04:09:02.550Z"
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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://github.com/YounesHfa/CVE-2026-74580",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-10-28T00:00:00+00:00",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3",
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"id": "CVE-2026-74580"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-29T03:57:01.255Z"
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}
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}
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]
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}
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} |