CVE-2022-0400Network attack vector

Remote system crash via unchecked SMC offset

Published Aug 29, 2022 · Updated Aug 2, 2024

Out-of-bounds read in the Linux Kernel SMC protocol stack allows remote attackers to crash the system with a crafted CLC proposal. The SMCv2 proposal parser uses an unvalidated v2_ext_offset field to compute a pointer in smc_get_clc_v2_ext(), permitting a read beyond the received message. The vulnerable SMC networking path must be reachable; the published record reports availability loss only, with no confidentiality or integrity impact.

CVSS severity7.5
High
EPSS probability1.75%
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 SMC protocol stack allows remote attackers to crash the system with a crafted CLC proposal. The SMCv2 proposal parser uses an unvalidated v2_ext_offset field to compute a pointer in smc_get_clc_v2_ext(), permitting a read beyond the received message. The vulnerable SMC networking path must be reachable; the published record reports availability loss only, with no confidentiality or integrity impact.

The record

CVE
CVE-2022-0400
Published
Aug 29, 2022
Updated
Aug 2, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=Not Known

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Not Known

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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