CVE-2022-50394

Memory disclosure and crash via unchecked block length

Published Sep 18, 2025 · Updated Sep 18, 2025

Out-of-bounds read in the Linux kernel allows local users to disclose kernel memory or crash the system through an iSMT SMBus ioctl. ismt_access uses the user-controlled data->block[0] value as a transfer length without first limiting it to the SMBus block maximum, causing memcpy to read past the buffer. Exploitation requires local access to an i2c-dev node backed by the Intel iSMT SMBus controller; a crafted I2C_SMBUS_BLOCK_DATA write can expose kernel data or crash the host.

CVSS severity7.1
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel allows local users to disclose kernel memory or crash the system through an iSMT SMBus ioctl. ismt_access uses the user-controlled data->block[0] value as a transfer length without first limiting it to the SMBus block maximum, causing memcpy to read past the buffer. Exploitation requires local access to an i2c-dev node backed by the Intel iSMT SMBus controller; a crafted I2C_SMBUS_BLOCK_DATA write can expose kernel data or crash the host.

The record

CVE
CVE-2022-50394
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record 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=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <03b7ef7a6c5ca1ff553470166b4919db88b810f6
  2. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <233348a04becf133283f0076e20b317302de21d9
  3. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <39244cc754829bf707dccd12e2ce37510f5b1f8d
  4. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a
  5. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <96c12fd0ec74641295e1c3c34dea3dce1b6c3422
  6. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <9ac541a0898e8ec187a3fa7024b9701cffae6bf2
  7. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <a642469d464b2780a25a49b51ae56623c65eac34
  8. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <bfe41d966c860a8ad4c735639d616da270c92735
  9. Affected versionversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd
  10. Affected versionversion=3.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <03b7ef7a6c5ca1ff553470166b4919db88b810f6; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <233348a04becf133283f0076e20b317302de21d9; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <39244cc754829bf707dccd12e2ce37510f5b1f8d; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <4a7bb1d93addb2f67e36fed00a53cb7f270d7b7a; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <96c12fd0ec74641295e1c3c34dea3dce1b6c3422; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <9ac541a0898e8ec187a3fa7024b9701cffae6bf2; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <a642469d464b2780a25a49b51ae56623c65eac34; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <bfe41d966c860a8ad4c735639d616da270c92735; version=13f35ac14cd0a9a1c4f0034c4c40d0ae98844ce9 <cdcbae2c5003747ddfd14e29db9c1d5d7e7c44dd; version=3.9

Published CVSS scores

7.1CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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