CVE-2022-49820

Service interruption via premature MCTP flow release

Published May 1, 2025 · Updated May 11, 2026

State-management error in Linux kernel 5.18 through 6.0.9 allows local users to interrupt service by expiring an unsent MCTP flow. The mctp_i2c_flow_release function increments release_count for a NEW flow although i2c_lock_count rises only after transmission, causing an accounting overflow and WARN_ON. Reachability requires the MCTP SMBus/I2C transport on an I2C slave-capable host; the operational effect depends on kernel warning handling.

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

What happened

State-management error in Linux kernel 5.18 through 6.0.9 allows local users to interrupt service by expiring an unsent MCTP flow. The mctp_i2c_flow_release function increments release_count for a NEW flow although i2c_lock_count rises only after transmission, causing an accounting overflow and WARN_ON. Reachability requires the MCTP SMBus/I2C transport on an I2C slave-capable host; the operational effect depends on kernel warning handling.

The record

CVE
CVE-2022-49820
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.18
  2. Affected versionversion=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <9cbd48d5fa14e4c65f8580de16686077f7cea02b
  3. Affected versionversion=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <a5915a9a3ab4067ef8996a57738d156eabeb3a12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <9cbd48d5fa14e4c65f8580de16686077f7cea02b; version=f5b8abf9fc3dacd7529d363e26fe8230935d65f8 <a5915a9a3ab4067ef8996a57738d156eabeb3a12

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1499Endpoint Denial of Service

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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