CVE-2026-43096

Guest-induced vCPU hang via permission-blind remapping

Published May 6, 2026 · Updated May 6, 2026

Denial of service in Linux Kernel 6.19 before 6.19.14 allows guest OS users to hang a vCPU through a denied GPA access. mshv_handle_gpa_intercept() remaps movable pages without first checking the requested access against region permissions, so the unchanged permission immediately faults again. Reachability requires an MSHV guest and a movable region that denies the attempted write or execute access; the resulting loop consumes host CPU resources.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux Kernel 6.19 before 6.19.14 allows guest OS users to hang a vCPU through a denied GPA access. mshv_handle_gpa_intercept() remaps movable pages without first checking the requested access against region permissions, so the unchanged permission immediately faults again. Reachability requires an MSHV guest and a movable region that denies the attempted write or execute access; the resulting loop consumes host CPU resources.

The record

CVE
CVE-2026-43096
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=6.19
  2. Affected versionversion=b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 <02226839079ccc558820a3b25c4c46812927b4ba
  3. Affected versionversion=b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 <16cbec24897624051b324aa3a85859c38ca65fde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 <02226839079ccc558820a3b25c4c46812927b4ba; version=b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 <16cbec24897624051b324aa3a85859c38ca65fde

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.

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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-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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