CVE-2023-52775Network attack vector

Remote application-data corruption via crossed SMC declines

Published May 21, 2024 · Updated Aug 5, 2026

Data corruption in Linux kernel SMC-R allows remote attackers to corrupt fallback TCP application data during connection setup. When an LLC confirmation times out, client and server DECLINE messages cross because both sides use overlapping timeouts, and TCP fallback reads a late SMC protocol message as application bytes. Reachability requires SMC-R negotiation and a failed LLC confirmation in the narrow timeout sequence; the bounded consequence is corruption of data delivered to an application.

CVSS severity8.2
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data corruption in Linux kernel SMC-R allows remote attackers to corrupt fallback TCP application data during connection setup. When an LLC confirmation times out, client and server DECLINE messages cross because both sides use overlapping timeouts, and TCP fallback reads a late SMC protocol message as application bytes. Reachability requires SMC-R negotiation and a failed LLC confirmation in the narrow timeout sequence; the bounded consequence is corruption of data delivered to an application.

The record

CVE
CVE-2023-52775
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <5ada292b5c504720a0acef8cae9acc62a694d19c
  2. Affected versionversion=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <7234d2b5dffa5af77fd4e0deaebab509e130c6b1
  3. Affected versionversion=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <90072af9efe8c7bd7d086709014ddd44cebd5e7c
  4. Affected versionversion=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <94a0ae698b4d5d5bb598e23228002a1491c50add
  5. Affected versionversion=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <e6d71b437abc2f249e3b6a1ae1a7228e09c6e563
  6. Affected versionversion=5.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <5ada292b5c504720a0acef8cae9acc62a694d19c; version=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <7234d2b5dffa5af77fd4e0deaebab509e130c6b1; version=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <90072af9efe8c7bd7d086709014ddd44cebd5e7c; version=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <94a0ae698b4d5d5bb598e23228002a1491c50add; version=0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 <e6d71b437abc2f249e3b6a1ae1a7228e09c6e563; version=5.8

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.2kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

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 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-787Out-of-bounds Write
T1565.002Transmitted Data Manipulation

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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