CVE-2026-74312 (GCVE-0-2026-74312)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-08-17 05:45
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In 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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 Version: ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/vhost/vdpa.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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},
{
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"lessThan": "5.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
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},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
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},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
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},
{
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"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
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},
{
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{
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is reached only via local mmap()/page-fault handling on /dev/vhost-vdpa-N (vma-\u003evm_pgoff selects the virtqueue); there is no network, adjacent-radio, or physical-device path to this code.\nAC:L - Once the device node is open, the attacker fully controls vm_pgoff and can pick any index up to 65535; no race, rare config, or victim-dependent timing is required to hit the out-of-range callback.\nPR:L - vhost_vdpa_open()/mmap() perform no capable() checks; in typical cloud/hypervisor deployments the vhost-vdpa char device is held by an unprivileged VMM/QEMU account (or a compromised QEMU), not init-namespace root.\nUI:N - Exploitation requires only the attacker\u0027s own open/mmap of the vhost-vdpa device with a crafted pgoff; no separate victim mount, click, or administrative action is needed.\nS:U - Impact stays within the host kernel security domain reached through the vhost-vdpa interface; it is not a guest-to-host VM escape or IOMMU-boundary bypass by itself.\nC:H - An out-of-range index drives driver get_vq_notification() callbacks (e.g. vp_vdpa/ifcvf/pds/octeon) to read past vring metadata; the returned notify.addr is then used by vmf_insert_pfn(), enabling arbitrary physical-page mapping and kernel memory disclosure.\nI:H - The mmap mapping is write-only doorbell access; remapping an attacker-chosen physical page via the corrupted notify.addr grants a write primitive to arbitrary physical memory and device MMIO, supporting control-flow or privilege manipulation.\nA:H - Invalid or attacker-influenced PFN insertion during fault handling can BUG/oops the kernel immediately; even without full exploitation, the out-of-bounds callback access provides a reliable host crash/DoS vector."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:45:44.929Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0f310bac6db9bd3bb1655707d692d9d2a86eeb17"
},
{
"url": "https://git.kernel.org/stable/c/4bf5a51963ff816f7443702dc536b9327cf5e550"
},
{
"url": "https://git.kernel.org/stable/c/55a644031e610ea93fbde2702c7b8f267476552f"
},
{
"url": "https://git.kernel.org/stable/c/2b3f79b90b231a682315fe2191bb71925650e183"
},
{
"url": "https://git.kernel.org/stable/c/bbba4f92515238d76018e9b75e41b16d83df52c8"
},
{
"url": "https://git.kernel.org/stable/c/1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e"
},
{
"url": "https://git.kernel.org/stable/c/32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d"
},
{
"url": "https://git.kernel.org/stable/c/929e4f044621c8cc30b612fb74e1410bef09e41b"
}
],
"title": "vhost/vdpa: validate virtqueue index in mmap and fault paths",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74312",
"datePublished": "2026-08-15T05:58:11.395Z",
"dateReserved": "2026-08-15T05:44:03.883Z",
"dateUpdated": "2026-08-17T05:45:44.929Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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