CVE-2026-23095Network attack vector

Remote denial of service via protocol-zero skb leak

Published Feb 4, 2026 · Updated Feb 4, 2026

Memory leak in the Linux kernel GUE receive path allows remote attackers to exhaust kernel memory with crafted protocol-0 packets. gue_udp_recv() returns zero for an inner protocol value of 0, so ip_protocol_deliver_rcu() treats success as no resubmit and leaves the packet buffer unreleased. The GUE receive path must accept repeated protocol-0 packets; each packet leaks an skb, allowing memory exhaustion and a system service interruption.

CVSS severity7.5
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel GUE receive path allows remote attackers to exhaust kernel memory with crafted protocol-0 packets. gue_udp_recv() returns zero for an inner protocol value of 0, so ip_protocol_deliver_rcu() treats success as no resubmit and leaves the packet buffer unreleased. The GUE receive path must accept repeated protocol-0 packets; each packet leaks an skb, allowing memory exhaustion and a system service interruption.

The record

CVE
CVE-2026-23095
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record 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=3.18
  2. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <5437a279804ced8088cabb945dba88a26d828f8c
  3. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <9a56796ad258786d3624eef5aefba394fc9bdded
  4. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <ce569b389a5c78d64788a5ea94560e17fa574b35
  5. Affected versionversion=37dd0247797b168ad1cc7f5dbec825a1ee66535b <f87b9b7a618c82e7465e872eb10e14c803871892

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.18; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <5437a279804ced8088cabb945dba88a26d828f8c; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <9a56796ad258786d3624eef5aefba394fc9bdded; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <ce569b389a5c78d64788a5ea94560e17fa574b35; version=37dd0247797b168ad1cc7f5dbec825a1ee66535b <f87b9b7a618c82e7465e872eb10e14c803871892

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5kernel.orgCVSS: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-401Missing Release of Memory after Effective Lifetime
T1499.001OS Exhaustion Flood

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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