CVE-2025-40051

Host kernel compromise via unchecked short copies

Published Oct 28, 2025 · Updated Oct 28, 2025

Memory corruption in Linux kernel 6.0 and later affected builds allows local users to compromise the host through vhost-vdpa ioctls. The vringh IOTLB copy path treats short copy_from_iter and copy_to_iter results as successful, leaving request data uninitialized and enabling out-of-bounds kernel heap reads and writes. Access to /dev/vhost-vdpa-N is required; a local process can disclose stale kernel data, overwrite kernel memory, or cause an oops or panic.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux kernel 6.0 and later affected builds allows local users to compromise the host through vhost-vdpa ioctls. The vringh IOTLB copy path treats short copy_from_iter and copy_to_iter results as successful, leaving request data uninitialized and enabling out-of-bounds kernel heap reads and writes. Access to /dev/vhost-vdpa-N is required; a local process can disclose stale kernel data, overwrite kernel memory, or cause an oops or panic.

The record

CVE
CVE-2025-40051
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2025Record 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=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <78dc7362662fedaa1928fb8e4f27401c8322905d
  2. Affected versionversion=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <82a8d0fda55b35361ee7f35b54fa2b66d7847d2b
  3. Affected versionversion=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <baa37b1c7e29546f79c39bef0d18c4edc9f39bb1
  4. Affected versionversion=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <cfa0654402c06d086201a9ff167eb95da5844fc3
  5. Affected versionversion=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <db042925a5ab7a550b710addeadbf6f72e3a8a4b
  6. Affected versionversion=6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <78dc7362662fedaa1928fb8e4f27401c8322905d; version=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <82a8d0fda55b35361ee7f35b54fa2b66d7847d2b; version=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <baa37b1c7e29546f79c39bef0d18c4edc9f39bb1; version=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <cfa0654402c06d086201a9ff167eb95da5844fc3; version=309bba39c945ac8ab8083ac05cd6cfe5822968e0 <db042925a5ab7a550b710addeadbf6f72e3a8a4b; version=6.0

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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

T1068Exploitation for Privilege Escalation

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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