CVE-2026-23236

Local system crash via direct user-pointer dereference

Published Mar 4, 2026 · Updated Mar 4, 2026

Improper user-pointer handling in the Linux Kernel smscufx driver allows local users to crash the system via a malformed damage ioctl. The ufx_ops_ioctl handler casts the UFX_IOCTL_REPORT_DAMAGE argument to struct dloarea and reads its fields directly instead of copying the structure into kernel memory. Exploitation requires local access to an active smscufx framebuffer device; malformed user memory can trigger a kernel fault and system crash.

CVSS severity7.3
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper user-pointer handling in the Linux Kernel smscufx driver allows local users to crash the system via a malformed damage ioctl. The ufx_ops_ioctl handler casts the UFX_IOCTL_REPORT_DAMAGE argument to struct dloarea and reads its fields directly instead of copying the structure into kernel memory. Exploitation requires local access to an active smscufx framebuffer device; malformed user memory can trigger a kernel fault and system crash.

The record

CVE
CVE-2026-23236
Published
Mar 4, 2026
Updated
Mar 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-367, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 4, 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 <061cfeb560aa3ddc174153dbe5be9d0b55eb7248
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0634e8d650993602fc5b389ff7ac525f6542e141
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <120adae7b42faa641179270c067864544a50ab69
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1c008ad0f0d1c1523902b9cdb08e404129677bfc
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52917e265aa5f848212f60fc50fc504d8ef12866
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6167af934f956d3ae1e06d61f45cd0d1004bbe1a
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0321e6e58facb39fe191caa0e52ed9aab6a48fe
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f1e91bd4efeae48b0f42caed7e8ce2e3a0d05b02

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <061cfeb560aa3ddc174153dbe5be9d0b55eb7248; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0634e8d650993602fc5b389ff7ac525f6542e141; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <120adae7b42faa641179270c067864544a50ab69; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1c008ad0f0d1c1523902b9cdb08e404129677bfc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52917e265aa5f848212f60fc50fc504d8ef12866; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6167af934f956d3ae1e06d61f45cd0d1004bbe1a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0321e6e58facb39fe191caa0e52ed9aab6a48fe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f1e91bd4efeae48b0f42caed7e8ce2e3a0d05b02

Published CVSS scores

7.3Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499Endpoint Denial of Service

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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