CVE-2026-23304

Local system crash via missing IPv6 VRF fallback

Published Mar 25, 2026 · Updated Mar 25, 2026

NULL pointer dereference in Linux Kernel IPv6 routing allows local users to crash affected systems while a device leaves a VRF. ip6_rt_get_dev_rcu() accepts a NULL result from l3mdev_master_dev_rcu() while a slave device is being detached from a VRF because ip6_rt_pcpu_alloc() lost its loopback-device fallback. Local users with low privileges must trigger IPv6 route output during the VRF un-slaving race; the published impact is a kernel crash without data disclosure or modification.

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

NULL pointer dereference in Linux Kernel IPv6 routing allows local users to crash affected systems while a device leaves a VRF. ip6_rt_get_dev_rcu() accepts a NULL result from l3mdev_master_dev_rcu() while a slave device is being detached from a VRF because ip6_rt_pcpu_alloc() lost its loopback-device fallback. Local users with low privileges must trigger IPv6 route output during the VRF un-slaving race; the published impact is a kernel crash without data disclosure or modification.

The record

CVE
CVE-2026-23304
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=4.14
  2. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <0b5a7826020706057cc5a9d9009e667027f221ee
  3. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a
  4. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <3310fc11fc47387d1dd4759b0bc961643ea11c7f
  5. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <4a48fe59f29f673a3d042d679f26629a9c3e29d4
  6. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <581800298313c9fd75e94985e6d37d21b7e35d34
  7. Affected versionversion=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <ae88c8256547b63980770a9ea7be73a15900d27e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.14; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <0b5a7826020706057cc5a9d9009e667027f221ee; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <3310fc11fc47387d1dd4759b0bc961643ea11c7f; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <4a48fe59f29f673a3d042d679f26629a9c3e29d4; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <581800298313c9fd75e94985e6d37d21b7e35d34; version=4832c30d5458387ff2533ff66fbde26ad8bb5a2d <ae88c8256547b63980770a9ea7be73a15900d27e

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499.004Application 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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