CVE-2026-43045

Memory corruption via incomplete page pinning

Published May 1, 2026 · Updated May 1, 2026

Memory corruption in the Linux Kernel MSHV driver 6.15 through 6.19.11 allows local users to corrupt kernel memory via region pinning. mshv_region_pin accepts a short pin_user_pages_fast result as success and miscounts a partially pinned batch during cleanup, causing partial-region use and leaked page references. Reachability requires local access to the MSHV region-registration path; the record establishes memory corruption and a reference leak but no reliable crash or code-execution outcome.

CVSS severity5.5
Medium
EPSS probability0.10%
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 the Linux Kernel MSHV driver 6.15 through 6.19.11 allows local users to corrupt kernel memory via region pinning. mshv_region_pin accepts a short pin_user_pages_fast result as success and miscounts a partially pinned batch during cleanup, causing partial-region use and leaked page references. Reachability requires local access to the MSHV region-registration path; the record establishes memory corruption and a reference leak but no reliable crash or code-execution outcome.

The record

CVE
CVE-2026-43045
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a7d149152bc5a9119854331c57be35ad31fdf5cc
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0e296f257671ba10249630fe58026f29e4804d9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a7d149152bc5a9119854331c57be35ad31fdf5cc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0e296f257671ba10249630fe58026f29e4804d9

Published CVSS scores

5.5NIST NVDCVSS: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

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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