293 lines
16 KiB
JSON
293 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-2024-47748",
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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": "2024-09-30T16:00:12.960Z",
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"datePublished": "2024-10-21T12:14:14.448Z",
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"dateUpdated": "2026-08-05T11:39:56.054Z"
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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": "2026-08-05T11:39:56.054Z"
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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_vdpa: assign irq bypass producer token correctly\n\nWe used to call irq_bypass_unregister_producer() in\nvhost_vdpa_setup_vq_irq() which is problematic as we don't know if the\ntoken pointer is still valid or not.\n\nActually, we use the eventfd_ctx as the token so the life cycle of the\ntoken should be bound to the VHOST_SET_VRING_CALL instead of\nvhost_vdpa_setup_vq_irq() which could be called by set_status().\n\nFixing this by setting up irq bypass producer's token when handling\nVHOST_SET_VRING_CALL and un-registering the producer before calling\nvhost_vring_ioctl() to prevent a possible use after free as eventfd\ncould have been released in vhost_vring_ioctl(). And such registering\nand unregistering will only be done if DRIVER_OK is set."
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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 vulnerability is reached exclusively through `ioctl()` calls (`VHOST_SET_VRING_CALL`, `VHOST_VDPA_SET_STATUS`) on the `/dev/vhost-vdpa-N` character device. This requires local access to the host; no network or adjacent-network path exists.\nAC:L - The attacker deterministically drives the entire sequence with ordinary ioctls — set a call fd, set DRIVER_OK, reset to invalidate the MSI vector, then rebind a new call fd — and controls both the eventfd allocation and the eventfd free, so the slab reuse that makes the stale token collide is attacker-driven grooming rather than an uncontrolled condition. No race with an independent party is involved.\nPR:L - No capability check exists anywhere on the path; the sole gate is DAC on the vhost-vdpa device node, which in the standard libvirt/QEMU hypervisor deployment is held by an unprivileged VMM account. An attacker with that account — or one who has compromised the QEMU process from a guest — reaches the bug without root.\nUI:N - The attacker performs the complete ioctl sequence and eventfd grooming from their own process. No action by any other user or administrator is needed.\nS:U - The vulnerable component and the primary impacted component are both the host kernel, so the memory corruption stays within a single security authority. The knock-on effect on other guests' interrupt-remapping entries is a consequence of host-kernel compromise rather than an exploit that crosses the boundary as its defining characteristic.\nC:H - The freed eventfd_ctx pointer is retained as an identity key in a global registry shared with KVM, and the resulting mismatched connect/disconnect plus irqbypass module refcount underflow give the attacker use-after-free access to kernel objects and module memory. Per standard kernel scoring, a use-after-free grants control over freed-object contents and is treated as enabling arbitrary kernel memory disclosure.\nI:H - The stale token causes `__disconnect()`/`__connect()` against the wrong consumer, reprogramming IOMMU interrupt-remapping entries for an unrelated VM with a foreign device IRQ, while the double `list_del()` on an already-unlinked node provides a linked-list unlink write primitive and the module refcount underflow enables a UAF on module text. These are exploitable for kernel memory corruption and control-flow hijacking.\nA:H - Executing `list_del()` on a node bearing `LIST_POISON1/LIST_POISON2` faults immediately with a general protection fault, and the mismatched KVM producer teardown trips `WARN_ON` and corrupts posted-interrupt state. This is a reliable kernel oops/panic that also disrupts unrelated guests on the host."
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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/vdpa.c"
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],
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"versions": [
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{
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"version": "2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60",
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"lessThan": "0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0",
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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": "2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60",
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"lessThan": "927a2580208e0f9b0b47b08f1c802b7233a7ba3c",
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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": "2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60",
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"lessThan": "ec5f1b54ceb23475049ada6e7a43452cf4df88d1",
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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": "2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60",
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"lessThan": "ca64edd7ae93402af2596a952e0d94d545e2b9c0",
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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": "2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60",
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"lessThan": "fae9b1776f53aab93ab345bdbf653b991aed717d",
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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": "2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60",
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"lessThan": "7cf2fb51175cafe01df8c43fa15a06194a59c6e2",
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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": "2cf1ba9a4d15cb78b96ea97f727b93382c3f9a60",
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"lessThan": "02e9e9366fefe461719da5d173385b6685f70319",
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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/vdpa.c"
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],
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"versions": [
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{
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"version": "5.9",
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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": "5.9",
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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": "5.10.227",
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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": "5.15.168",
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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": "6.1.113",
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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": "6.6.54",
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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": "6.10.13",
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"lessThanOrEqual": "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": "6.11.2",
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"lessThanOrEqual": "6.11.*",
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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": "6.12",
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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": "5.9",
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"versionEndExcluding": "5.10.227"
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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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"references": [
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"url": "https://git.kernel.org/stable/c/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0"
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},
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{
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"url": "https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3c"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0"
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},
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{
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"url": "https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717d"
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},
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{
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"url": "https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2"
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},
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{
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"url": "https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319"
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}
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],
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"title": "vhost_vdpa: assign irq bypass producer token correctly",
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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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"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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"id": "CVE-2024-47748",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-10-21T12:58:17.248658Z"
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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": "2024-10-21T13:04:13.447Z"
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}
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},
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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": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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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": "2025-11-03T22:21:42.762Z"
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}
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}
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]
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}
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} |