CVE-2026-53344

Kernel crash via uninitialized SPI driver fields

Published Jul 1, 2026 · Updated Jul 1, 2026

NULL pointer dereference in Linux Kernel 6.19 allows local users to crash the kernel during MCP23S08 SPI driver probe. The driver probe calls mcp23s08_spi_regmap_init before assigning mcp->dev and mcp->addr, so cache population attempts an SPI read through unset fields. The gate is local low-privileged access plus a probe of the affected MCP23S08 SPI driver; the bounded result is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel 6.19 allows local users to crash the kernel during MCP23S08 SPI driver probe. The driver probe calls mcp23s08_spi_regmap_init before assigning mcp->dev and mcp->addr, so cache population attempts an SPI read through unset fields. The gate is local low-privileged access plus a probe of the affected MCP23S08 SPI driver; the bounded result is a kernel crash.

The record

CVE
CVE-2026-53344
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=6.19
  2. Affected versionversion=f9f4fda15e720686f1b2b436591ab11255e4e85e <3a13bb9540dfd7014c5601608afcbbadbbcfd673
  3. Affected versionversion=f9f4fda15e720686f1b2b436591ab11255e4e85e <8473c3a197b57ff01396f7a2ec6ddf65383820d4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=f9f4fda15e720686f1b2b436591ab11255e4e85e <3a13bb9540dfd7014c5601608afcbbadbbcfd673; version=f9f4fda15e720686f1b2b436591ab11255e4e85e <8473c3a197b57ff01396f7a2ec6ddf65383820d4

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-908Use of Uninitialized Resource
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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