CVE-2026-93287Hinoki check available

Kernel crash via oversized SMBus block transfers

Published Sep 24, 2026 · Updated Sep 24, 2026

Out-of-bounds memory access in the Linux kernel I2C/SMBus core allows local users to crash the kernel via oversized block transfers. In __i2c_smbus_xfer(), length validation occurs after the smbus_write tracepoint and is bypassed for native smbus_xfer callbacks, allowing copies and i2c-stub loops to exceed 34-byte buffers. Triggering the flaw requires write access to an I2C device node and a path that processes a caller-supplied block length; observed effects are out-of-bounds reads and writes.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds memory access in the Linux kernel I2C/SMBus core allows local users to crash the kernel via oversized block transfers. In __i2c_smbus_xfer(), length validation occurs after the smbus_write tracepoint and is bypassed for native smbus_xfer callbacks, allowing copies and i2c-stub loops to exceed 34-byte buffers. Triggering the flaw requires write access to an I2C device node and a path that processes a caller-supplied block length; observed effects are out-of-bounds reads and writes.

The record

CVE
CVE-2026-93287
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=2.6.33
  2. Affected versionversion=4710317891e4824ce1510a6b5066abbd3e917750 <3051cd060fa496df42954291fa2306ed2eab4ecc
  3. Affected versionversion=4710317891e4824ce1510a6b5066abbd3e917750 <c4b478bc50b7ca9865e237909941253a0f7111a2
  4. Affected versionversion=4710317891e4824ce1510a6b5066abbd3e917750 <f09edffba97d37b1fdff5f818a9a45f8a98ac171

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=4710317891e4824ce1510a6b5066abbd3e917750 <3051cd060fa496df42954291fa2306ed2eab4ecc; version=4710317891e4824ce1510a6b5066abbd3e917750 <c4b478bc50b7ca9865e237909941253a0f7111a2; version=4710317891e4824ce1510a6b5066abbd3e917750 <f09edffba97d37b1fdff5f818a9a45f8a98ac171

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

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