CVE-2026-23381

Kernel crash via disabled-IPv6 neighbor suppression

Published Mar 25, 2026 · Updated Mar 25, 2026

NULL pointer dereference in Linux Kernel from 4.15 allows local users to crash the kernel through Neighbor Discovery traffic. br_do_suppress_nd() passes the uninitialized ipv6_stub->nd_tbl pointer to neigh_lookup() when IPv6 initialization has been skipped. Triggering the crash requires ipv6.disable=1 at boot, bridge neighbor suppression enabled, and an ICMPv6 Neighbor Discovery packet reaching the bridge.

CVSS severity5.5
Medium
EPSS probability0.12%
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 Linux Kernel from 4.15 allows local users to crash the kernel through Neighbor Discovery traffic. br_do_suppress_nd() passes the uninitialized ipv6_stub->nd_tbl pointer to neigh_lookup() when IPv6 initialization has been skipped. Triggering the crash requires ipv6.disable=1 at boot, bridge neighbor suppression enabled, and an ICMPv6 Neighbor Discovery packet reaching the bridge.

The record

CVE
CVE-2026-23381
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
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=4.15
  2. Affected versionversion=ed842faeb2bd49256f00485402f3113205f91d30 <20ef5c25422f97dd09d751e5ae6c18406cdc78e6
  3. Affected versionversion=ed842faeb2bd49256f00485402f3113205f91d30 <33dec6f10777d5a8f71c0a200f690da5ae3c2e55
  4. Affected versionversion=ed842faeb2bd49256f00485402f3113205f91d30 <7a894eb5de246d79f13105c55a67381039a24d44
  5. Affected versionversion=ed842faeb2bd49256f00485402f3113205f91d30 <a12cdaa3375f0bd3c8f4e564be7c143529abfe5b
  6. Affected versionversion=ed842faeb2bd49256f00485402f3113205f91d30 <aa73deb3b6b730ec280d45b3f423bfa9e17bc122
  7. Affected versionversion=ed842faeb2bd49256f00485402f3113205f91d30 <e5e890630533bdc15b26a34bb8e7ef539bdf1322

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.15; version=ed842faeb2bd49256f00485402f3113205f91d30 <20ef5c25422f97dd09d751e5ae6c18406cdc78e6; version=ed842faeb2bd49256f00485402f3113205f91d30 <33dec6f10777d5a8f71c0a200f690da5ae3c2e55; version=ed842faeb2bd49256f00485402f3113205f91d30 <7a894eb5de246d79f13105c55a67381039a24d44; version=ed842faeb2bd49256f00485402f3113205f91d30 <a12cdaa3375f0bd3c8f4e564be7c143529abfe5b; version=ed842faeb2bd49256f00485402f3113205f91d30 <aa73deb3b6b730ec280d45b3f423bfa9e17bc122; version=ed842faeb2bd49256f00485402f3113205f91d30 <e5e890630533bdc15b26a34bb8e7ef539bdf1322

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
T1499Endpoint Denial of Service

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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