CVE-2023-54004Network attack vector

Remote system crash via UDP-Lite memory accounting

Published Dec 24, 2025 · Updated Dec 24, 2025

NULL pointer dereference in the Linux kernel 4.10 through 6.3.4 allows remote attackers to crash hosts via UDP-Lite datagrams. The UDP-Lite protocol tables leave sysctl_wmem_offset unset, so __sk_mem_raise_allocated passes a NULL sysctl_rmem pointer to sk_get_rmem0 after shared UDP memory crosses its threshold. A bound UDP-Lite socket and enough inbound traffic to raise the shared allocation counter are required; the resulting softirq fault interrupts the system.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel 4.10 through 6.3.4 allows remote attackers to crash hosts via UDP-Lite datagrams. The UDP-Lite protocol tables leave sysctl_wmem_offset unset, so __sk_mem_raise_allocated passes a NULL sysctl_rmem pointer to sk_get_rmem0 after shared UDP memory crosses its threshold. A bound UDP-Lite socket and enough inbound traffic to raise the shared allocation counter are required; the resulting softirq fault interrupts the system.

The record

CVE
CVE-2023-54004
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record 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=4.10
  2. Affected versionversion=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <2a112f04629f7839e7cb509b27b8d3b735afe255
  3. Affected versionversion=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <387bd0a3af3bdd2b16f8dbef0c9fcccac63000a4
  4. Affected versionversion=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <5014b64e369bdf997935b132a1ac4d64b6e47ad4
  5. Affected versionversion=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <7e3ae83371a4809da6fa3f10ccc430eecef3034a
  6. Affected versionversion=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <ad42a35bdfc6d3c0fc4cb4027d7b2757ce665665
  7. Affected versionversion=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <cc56de054d828935aa37734b479f82fa34b5f9bd
  8. Affected versionversion=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <f04c8eaf45e7dcdfccba936506b1ec592a369fb9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <2a112f04629f7839e7cb509b27b8d3b735afe255; version=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <387bd0a3af3bdd2b16f8dbef0c9fcccac63000a4; version=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <5014b64e369bdf997935b132a1ac4d64b6e47ad4; version=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <7e3ae83371a4809da6fa3f10ccc430eecef3034a; version=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <ad42a35bdfc6d3c0fc4cb4027d7b2757ce665665; version=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <cc56de054d828935aa37734b479f82fa34b5f9bd; version=850cbaddb52dfd4e0c7cabe2c168dd34b44ae0b9 <f04c8eaf45e7dcdfccba936506b1ec592a369fb9

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

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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