vhost/vdpa: validate virtqueue index in mmap and fault paths

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74312
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:31 UTC
Updated2026-08-17 06:19:25 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001290000 probability, percentile 0.029830000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 0f310bac6db9bd3bb1655707d692d9d2a86eeb17 git Not specified
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 4bf5a51963ff816f7443702dc536b9327cf5e550 git Not specified
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 55a644031e610ea93fbde2702c7b8f267476552f git Not specified
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 2b3f79b90b231a682315fe2191bb71925650e183 git Not specified
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 bbba4f92515238d76018e9b75e41b16d83df52c8 git Not specified
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e git Not specified
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d git Not specified
CNA Linux Linux affected ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 929e4f044621c8cc30b612fb74e1410bef09e41b git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2b3f79b90b231a682315fe2191bb71925650e183 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4bf5a51963ff816f7443702dc536b9327cf5e550 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bbba4f92515238d76018e9b75e41b16d83df52c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/929e4f044621c8cc30b612fb74e1410bef09e41b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/55a644031e610ea93fbde2702c7b8f267476552f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f310bac6db9bd3bb1655707d692d9d2a86eeb17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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