CVE-2026-23293

Service interruption via VXLAN IPv6 NULL dereference

Published Mar 25, 2026 · Updated Mar 25, 2026

A NULL pointer dereference in the Linux Kernel VXLAN path allows local users to interrupt service by transmitting an IPv6 packet. With IPv6 disabled at boot, inet6_init exits before ndisc_init initializes nd_tbl, but route_shortcircuit still passes that NULL table to neigh_lookup. Exploitation requires ipv6.disable=1, a VXLAN transmit path, and local packet-injection access; the resulting kernel oops affects availability.

CVSS severity5.5
Medium
EPSS probability0.13%
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 Kernel VXLAN path allows local users to interrupt service by transmitting an IPv6 packet. With IPv6 disabled at boot, inet6_init exits before ndisc_init initializes nd_tbl, but route_shortcircuit still passes that NULL table to neigh_lookup. Exploitation requires ipv6.disable=1, a VXLAN transmit path, and local packet-injection access; the resulting kernel oops affects availability.

The record

CVE
CVE-2026-23293
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=3.12
  2. Affected versionversion=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <168ff39e4758897d2eee4756977d036d52884c7e
  3. Affected versionversion=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <5f93e6b4d12bd3a4517a6d447ea675f448f21434
  4. Affected versionversion=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <abcd48ecdeb2e12eccb8339a35534c757782afcd
  5. Affected versionversion=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <b5190fcd75a1f1785c766a8d1e44d3938e168f45
  6. Affected versionversion=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <f0373e9317bc904e7bdb123d3106fe4f3cea2fb7
  7. Affected versionversion=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <fbbd2118982c55fb9b0a753ae0cf7194e77149fb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.12; version=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <168ff39e4758897d2eee4756977d036d52884c7e; version=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <5f93e6b4d12bd3a4517a6d447ea675f448f21434; version=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <abcd48ecdeb2e12eccb8339a35534c757782afcd; version=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <b5190fcd75a1f1785c766a8d1e44d3938e168f45; version=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <f0373e9317bc904e7bdb123d3106fe4f3cea2fb7; version=e15a00aafa4b7953ad717d3cb1ad7acf4ff76945 <fbbd2118982c55fb9b0a753ae0cf7194e77149fb

Published CVSS scores

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.

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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)
Vectorlocal
Privilegesauthenticated
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.

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Technologies

Your stack

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Your stack

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