194 lines
9.6 KiB
JSON
194 lines
9.6 KiB
JSON
{
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"cveId": "CVE-2021-47604",
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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": "2024-05-24T15:11:00.736Z",
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"datePublished": "2024-06-19T14:54:03.664Z",
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"dateUpdated": "2026-08-05T08:48:33.959Z"
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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\nvduse: check that offset is within bounds in get_config()\n\nThis condition checks \"len\" but it does not check \"offset\" and that\ncould result in an out of bounds read if \"offset > dev->config_size\".\nThe problem is that since both variables are unsigned the\n\"dev->config_size - offset\" subtraction would result in a very high\nunsigned value.\n\nI think these checks might not be necessary because \"len\" and \"offset\"\nare supposed to already have been validated using the\nvhost_vdpa_config_validate() function. But I do not know the code\nperfectly, and I like to be safe."
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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:N/A:H",
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"baseScore": 7.1,
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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 vulnerable get_config path is reached through local interfaces (vhost-vdpa ioctl VHOST_VDPA_GET_CONFIG or virtio-vdpa config reads after attaching a VDUSE device), not via network packets.\nAC:L - The attacker fully controls offset and length through the ioctl (or by creating a VDUSE device with a small config_size and feature bits that cause larger-offset reads); no race or other condition beyond attacker control is required.\nPR:L - Exploitation requires access to vhost-vdpa/VDUSE device nodes that are commonly granted to non-root virtualization users (e.g., qemu/kvm group), not capabilities that are only available to real root in the init user namespace.\nUI:N - No victim interaction is needed; the attacker triggers the OOB read directly via ioctl or by attaching/probing the malicious VDUSE device.\nS:U - Impact is confined to the host kernel and the calling process (kernel memory disclosure or oops); this does not cross a VM/IOMMU/sandbox security authority boundary by itself.\nC:H - The underflow allows an unbounded out-of-bounds read from kernel memory past the config buffer, and on the vhost-vdpa path that data is copied to userspace via copy_to_user, enabling arbitrary kernel memory disclosure.\nI:N - The bug is a pure out-of-bounds read (memcpy from config+offset into a destination buffer) with no write primitive or integrity modification of kernel state.\nA:H - A sufficiently large or far OOB read can access unmapped memory and cause a kernel oops/panic, resulting in a full denial of service."
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}
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]
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}
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],
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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/vdpa/vdpa_user/vduse_dev.c"
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],
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"versions": [
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{
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"version": "0",
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"versionType": "semver"
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},
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"version": "5.15.11",
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"lessThanOrEqual": "5.15.*",
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"title": "vduse: check that offset is within bounds in get_config()",
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