vhost/vdpa: validate virtqueue index in mmap and fault paths
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.
CVE-2026-74312
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74312
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "0f310bac6db9bd3bb1655707d692d9d2a86eeb17",
"versionType": "git"
},
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "4bf5a51963ff816f7443702dc536b9327cf5e550",
"versionType": "git"
},
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "55a644031e610ea93fbde2702c7b8f267476552f",
"versionType": "git"
},
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "2b3f79b90b231a682315fe2191bb71925650e183",
"versionType": "git"
},
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "bbba4f92515238d76018e9b75e41b16d83df52c8",
"versionType": "git"
},
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e",
"versionType": "git"
},
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d",
"versionType": "git"
},
{
"status": "affected",
"version": "ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9",
"lessThan": "929e4f044621c8cc30b612fb74e1410bef09e41b",
"versionType": "git"
}
],
"programFiles": [
"drivers/vhost/vdpa.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/vhost/vdpa.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74312
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33091 · Revision 1
- Added to Heist Feed
- Publisher date