CVE-2023-52513Network attack vector

Kernel crash via NULL listener dereference

Published Mar 2, 2024 · Updated Aug 5, 2026

A NULL pointer dereference in the Linux Soft-iWARP connection handler allows remote attackers to crash the kernel through an MPA handshake. After immediate MPA processing fails, later TCP-close handling in siw_cm_work_handler dereferences the endpoint's already-cleared listener. An unauthenticated peer must reach a listening SIW endpoint; an invalid MPA request followed by TCP closure deterministically causes the availability-only failure.

CVSS severity7.5
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

A NULL pointer dereference in the Linux Soft-iWARP connection handler allows remote attackers to crash the kernel through an MPA handshake. After immediate MPA processing fails, later TCP-close handling in siw_cm_work_handler dereferences the endpoint's already-cleared listener. An unauthenticated peer must reach a listening SIW endpoint; an invalid MPA request followed by TCP closure deterministically causes the availability-only failure.

The record

CVE
CVE-2023-52513
Published
Mar 2, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 2, 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=5.3
  2. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <0d520cdb0cd095eac5d00078dfd318408c9b5eed
  3. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <53a3f777049771496f791504e7dc8ef017cba590
  4. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <5cf38e638e5d01b68f9133968a85e8b3fd1ecf2f
  5. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <6e26812e289b374c17677d238164a5a8f5770594
  6. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <81b7bf367eea795d259d0261710c6a89f548844d
  7. Affected versionversion=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <eeafc50a77f6a783c2c44e7ec3674a7b693e06f8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <0d520cdb0cd095eac5d00078dfd318408c9b5eed; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <53a3f777049771496f791504e7dc8ef017cba590; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <5cf38e638e5d01b68f9133968a85e8b3fd1ecf2f; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <6e26812e289b374c17677d238164a5a8f5770594; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <81b7bf367eea795d259d0261710c6a89f548844d; version=6c52fdc244b5ccc468006fd65a504d4ee33743c7 <eeafc50a77f6a783c2c44e7ec3674a7b693e06f8

Published CVSS scores

7.5Linux kernel CVE teamCVSS: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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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