CVE-2026-74312

System crash via unchecked virtqueue mapping index

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds access in the Linux kernel vhost/vDPA subsystem from 5.8 allows local users to crash the system through a crafted mapping. vhost_vdpa_mmap() and vhost_vdpa_fault() treat vma->vm_pgoff as a virtqueue index and pass values below u16 but beyond v->nvqs to driver callbacks. Low-privilege local access to an affected vhost/vDPA device is required; an invalid callback result can drive an invalid PFN remap and crash the host.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux kernel vhost/vDPA subsystem from 5.8 allows local users to crash the system through a crafted mapping. vhost_vdpa_mmap() and vhost_vdpa_fault() treat vma->vm_pgoff as a virtqueue index and pass values below u16 but beyond v->nvqs to driver callbacks. Low-privilege local access to an affected vhost/vDPA device is required; an invalid callback result can drive an invalid PFN remap and crash the host.

The record

CVE
CVE-2026-74312
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8
  2. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <0f310bac6db9bd3bb1655707d692d9d2a86eeb17
  3. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e
  4. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <2b3f79b90b231a682315fe2191bb71925650e183
  5. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d
  6. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <4bf5a51963ff816f7443702dc536b9327cf5e550
  7. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <55a644031e610ea93fbde2702c7b8f267476552f
  8. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <929e4f044621c8cc30b612fb74e1410bef09e41b
  9. Affected versionversion=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <bbba4f92515238d76018e9b75e41b16d83df52c8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <0f310bac6db9bd3bb1655707d692d9d2a86eeb17; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <2b3f79b90b231a682315fe2191bb71925650e183; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <4bf5a51963ff816f7443702dc536b9327cf5e550; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <55a644031e610ea93fbde2702c7b8f267476552f; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <929e4f044621c8cc30b612fb74e1410bef09e41b; version=ddd89d0a059d8e9740c75a97e0efe9bf07ee51f9 <bbba4f92515238d76018e9b75e41b16d83df52c8

Published CVSS scores

7.8CVE ProgramCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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