CVE-2026-23432Hinoki check available

Kernel memory corruption via stale MMU notifier

Published Apr 3, 2026 · Updated Apr 3, 2026

Use-after-free in Linux Kernel 6.19 through 6.19.9 and 7.0-rc1 through 7.0-rc7 allows local users to corrupt kernel memory or panic the host. mshv_map_user_memory directly frees an error-path region without unregistering its MMU interval notifier, so a later unmap invokes the notifier on freed memory. Reaching the flaw requires local access to /dev/mshv or a partition file descriptor and the MSHV_SET_GUEST_MEMORY ioctl; it is not a guest-to-host path.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Use-after-free in Linux Kernel 6.19 through 6.19.9 and 7.0-rc1 through 7.0-rc7 allows local users to corrupt kernel memory or panic the host. mshv_map_user_memory directly frees an error-path region without unregistering its MMU interval notifier, so a later unmap invokes the notifier on freed memory. Reaching the flaw requires local access to /dev/mshv or a partition file descriptor and the MSHV_SET_GUEST_MEMORY ioctl; it is not a guest-to-host path.

The record

CVE
CVE-2026-23432
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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 <34861bdc0c0196b6c2dd48f7454029407704ff6e
  3. Affected versionversion=b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 <6922db250422a0dfee34de322f86b7a73d713d33

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 <34861bdc0c0196b6c2dd48f7454029407704ff6e; version=b9a66cd5ccbb9fade15d0e427e19470d8ad35b75 <6922db250422a0dfee34de322f86b7a73d713d33

Published CVSS scores

7.8Linux kernel.org CNACVSS: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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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