CVE-2023-52809

Kernel crash via unchecked remote-port allocation failure

Published May 21, 2024 · Updated May 11, 2026

A NULL pointer dereference in Linux allows local users to crash the kernel during Fibre Channel point-to-point remote-port setup. In fc_lport_ptp_setup(), the libfc driver fails to test whether fc_rport_create() returned NULL before dereferencing the remote-port pointer. Reaching the fault requires the libfc point-to-point path and a remote-port allocation failure; public records do not establish attacker control over that failure.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A NULL pointer dereference in Linux allows local users to crash the kernel during Fibre Channel point-to-point remote-port setup. In fc_lport_ptp_setup(), the libfc driver fails to test whether fc_rport_create() returned NULL before dereferencing the remote-port pointer. Reaching the fault requires the libfc point-to-point path and a remote-port allocation failure; public records do not establish attacker control over that failure.

The record

CVE
CVE-2023-52809
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE 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

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=2.6.29
  2. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <442fd24d7b6b29e4a9cd9225afba4142d5f522ba
  3. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <4df105f0ce9f6f30cda4e99f577150d23f0c9c5f
  4. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <56d78b5495ebecbb9395101f3be177cd0a52450b
  5. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <6b9ecf4e1032e645873933e5b43cbb84cac19106
  6. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <77072ec41d6ab3718c3fc639bc149b8037caedfa
  7. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <930f0aaba4820d6362de4e6ed569eaf444f1ea4e
  8. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <b549acf999824d4f751ca57965700372f2f3ad00
  9. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <bb83f79f90e92f46466adcfd4fd264a7ae0f0f01
  10. Affected versionversion=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <f6fe7261b92b21109678747f36df9fdab1e30c34

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.29; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <442fd24d7b6b29e4a9cd9225afba4142d5f522ba; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <4df105f0ce9f6f30cda4e99f577150d23f0c9c5f; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <56d78b5495ebecbb9395101f3be177cd0a52450b; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <6b9ecf4e1032e645873933e5b43cbb84cac19106; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <77072ec41d6ab3718c3fc639bc149b8037caedfa; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <930f0aaba4820d6362de4e6ed569eaf444f1ea4e; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <b549acf999824d4f751ca57965700372f2f3ad00; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <bb83f79f90e92f46466adcfd4fd264a7ae0f0f01; version=42e9a92fe6a9095bd68a379aaec7ad2be0337f7a <f6fe7261b92b21109678747f36df9fdab1e30c34

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo