CVE-2026-23215

Local system crash via truncated hypercall pointer

Published Feb 18, 2026 · Updated Feb 18, 2026

Kernel pointer corruption in Linux kernel 6.11 and affected later branches allows local users to crash the system via VMware mouse input. QEMU's VMware mouse emulation stores register state in 32-bit array elements, clears the upper half of RDI, and returns a truncated kernel pointer that faults when dereferenced after vmware_hypercall3 or vmware_hypercall4. The condition requires an x86 guest using the affected VMware mouse emulation; the reported consequence is a kernel page fault and system crash.

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

Kernel pointer corruption in Linux kernel 6.11 and affected later branches allows local users to crash the system via VMware mouse input. QEMU's VMware mouse emulation stores register state in 32-bit array elements, clears the upper half of RDI, and returns a truncated kernel pointer that faults when dereferenced after vmware_hypercall3 or vmware_hypercall4. The condition requires an x86 guest using the affected VMware mouse emulation; the reported consequence is a kernel page fault and system crash.

The record

CVE
CVE-2026-23215
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2687c848e57820651b9f69d30c4710f4219f7dbf
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f467a92df61eb516a4ec36ee16234dd4e5ccf00
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <feb603a69f830acb58f78d604f0c29e63cd38f87

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2687c848e57820651b9f69d30c4710f4219f7dbf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f467a92df61eb516a4ec36ee16234dd4e5ccf00; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <feb603a69f830acb58f78d604f0c29e63cd38f87

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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

T1499.004Application 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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