GHSA-VX5G-7FCV-7H84
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
vhost/vdpa: validate virtqueue index in mmap and fault paths
vhost_vdpa_mmap() and vhost_vdpa_fault() use vma->vm_pgoff as a virtqueue index for get_vq_notification(), but they do not validate that the index is smaller than v->nvqs.
The ioctl path already performs both a bounds check and array_index_nospec(), but the mmap/fault path only checks that the index fits in u16. This allows an out-of-range queue index to reach driver-specific get_vq_notification() callbacks.
Fix this by extracting a unified vhost_vdpa_get_vq_notification() helper that validates the queue index against v->nvqs and applies array_index_nospec() before calling the driver callback. Both the mmap and fault paths use this helper, and the bounds checking is consolidated into a single location.
From source inspection, the most defensible impact is out-of-bounds access in the callback path, potentially leading to invalid PFN remaps and crash/DoS.
{
"affected": [],
"aliases": [
"CVE-2026-74312"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:31Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost/vdpa: validate virtqueue index in mmap and fault paths\n\nvhost_vdpa_mmap() and vhost_vdpa_fault() use vma-\u003evm_pgoff as a\nvirtqueue index for get_vq_notification(), but they do not validate\nthat the index is smaller than v-\u003envqs.\n\nThe ioctl path already performs both a bounds check and\narray_index_nospec(), but the mmap/fault path only checks that the\nindex fits in u16. This allows an out-of-range queue index to reach\ndriver-specific get_vq_notification() callbacks.\n\nFix this by extracting a unified vhost_vdpa_get_vq_notification()\nhelper that validates the queue index against v-\u003envqs and applies\narray_index_nospec() before calling the driver callback. Both the\nmmap and fault paths use this helper, and the bounds checking is\nconsolidated into a single location.\n\nFrom source inspection, the most defensible impact is out-of-bounds\naccess in the callback path, potentially leading to invalid PFN\nremaps and crash/DoS.",
"id": "GHSA-vx5g-7fcv-7h84",
"modified": "2026-08-17T06:33:37Z",
"published": "2026-08-15T06:32:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74312"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0f310bac6db9bd3bb1655707d692d9d2a86eeb17"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2b3f79b90b231a682315fe2191bb71925650e183"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4bf5a51963ff816f7443702dc536b9327cf5e550"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55a644031e610ea93fbde2702c7b8f267476552f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/929e4f044621c8cc30b612fb74e1410bef09e41b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bbba4f92515238d76018e9b75e41b16d83df52c8"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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