CVE-2022-48632

Local privilege escalation via unchecked SMBus length

Published Apr 28, 2024 · Updated Aug 5, 2026

Out-of-bounds write in the Linux MLXBF I2C driver allows local users to gain kernel privileges through a crafted SMBus request. The mlxbf_i2c_smbus_start_transaction() loop copies operation data into a stack buffer without bounding operation->length as data_idx advances. Low-privileged local access and a system using the MLXBF I2C controller are required; successful exploitation can corrupt kernel memory or crash the system.

CVSS severity7.8
High
EPSS probability0.25%
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 write in the Linux MLXBF I2C driver allows local users to gain kernel privileges through a crafted SMBus request. The mlxbf_i2c_smbus_start_transaction() loop copies operation data into a stack buffer without bounding operation->length as data_idx advances. Low-privileged local access and a system using the MLXBF I2C controller are required; successful exploitation can corrupt kernel memory or crash the system.

The record

CVE
CVE-2022-48632
Published
Apr 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.10
  2. Affected versionversion=b5b5b32081cd206baa6e58cca7f112d9723785d6 <3b5ab5fbe69ebbee5692c72b05071a43fc0655d8
  3. Affected versionversion=b5b5b32081cd206baa6e58cca7f112d9723785d6 <48ee0a864d1af02eea98fc825cc230d61517a71e
  4. Affected versionversion=b5b5b32081cd206baa6e58cca7f112d9723785d6 <dc2a0c587006f29b724069740c48654b9dcaebd2
  5. Affected versionversion=b5b5b32081cd206baa6e58cca7f112d9723785d6 <de24aceb07d426b6f1c59f33889d6a964770547b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=b5b5b32081cd206baa6e58cca7f112d9723785d6 <3b5ab5fbe69ebbee5692c72b05071a43fc0655d8; version=b5b5b32081cd206baa6e58cca7f112d9723785d6 <48ee0a864d1af02eea98fc825cc230d61517a71e; version=b5b5b32081cd206baa6e58cca7f112d9723785d6 <dc2a0c587006f29b724069740c48654b9dcaebd2; version=b5b5b32081cd206baa6e58cca7f112d9723785d6 <de24aceb07d426b6f1c59f33889d6a964770547b

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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