CVE-2022-49900

Kernel crash via stale piix4 adapter callback

Published May 1, 2025 · Updated May 11, 2026

Use-after-free in the Linux kernel piix4 I2C driver allows local users to crash the kernel after the affected adapter is removed. piix4_add_adapter() leaves piix4_adapter_count at zero, so piix4_remove() skips unregistering the single adapter and later I2C registration calls its freed smbus_algorithm callback. Reaching the demonstrated kernel oops requires privileged module removal and a PIIX4 single-adapter configuration; the documented consequence is a kernel crash.

CVSS severity7.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel piix4 I2C driver allows local users to crash the kernel after the affected adapter is removed. piix4_add_adapter() leaves piix4_adapter_count at zero, so piix4_remove() skips unregistering the single adapter and later I2C registration calls its freed smbus_algorithm callback. Reaching the demonstrated kernel oops requires privileged module removal and a PIIX4 single-adapter configuration; the documented consequence is a kernel crash.

The record

CVE
CVE-2022-49900
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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?

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  1. Affected versionversion=528d53a1592b0e27c423f7cafc1df85f77fc1163 <569bea74c94d37785682b11bab76f557520477cd
  2. Affected versionversion=528d53a1592b0e27c423f7cafc1df85f77fc1163 <bfd5e62f9a7ee214661cb6f143a3b40ccc63317f
  3. Affected versionversion=528d53a1592b0e27c423f7cafc1df85f77fc1163 <d78ccdce662e88f41e87e90cf2bee63c1715d2a5
  4. Affected versionversion=528d53a1592b0e27c423f7cafc1df85f77fc1163 <fe51636fffc8108c7c4da6aa393010e786530ad9
  5. Affected versionversion=5.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=528d53a1592b0e27c423f7cafc1df85f77fc1163 <569bea74c94d37785682b11bab76f557520477cd; version=528d53a1592b0e27c423f7cafc1df85f77fc1163 <bfd5e62f9a7ee214661cb6f143a3b40ccc63317f; version=528d53a1592b0e27c423f7cafc1df85f77fc1163 <d78ccdce662e88f41e87e90cf2bee63c1715d2a5; version=528d53a1592b0e27c423f7cafc1df85f77fc1163 <fe51636fffc8108c7c4da6aa393010e786530ad9; version=5.4

Published CVSS scores

7.8NISTCVSS: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

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free

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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