CVE-2026-23442

Local system crash via unchecked IPv6 device

Published Apr 3, 2026 · Updated Apr 3, 2026

NULL pointer dereference in affected Linux Kernel releases allows local users to crash the system through IPv6 SRv6 processing. __in6_dev_get() can return NULL for a device without IPv6 configuration, but seg6_hmac_validate_skb() and ipv6_srh_rcv() dereference the returned idev. Reachability requires the SRv6 paths and a device lacking IPv6 configuration, such as after device unregister or with an undersized MTU; the documented consequence is loss of system availability.

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 affected Linux Kernel releases allows local users to crash the system through IPv6 SRv6 processing. __in6_dev_get() can return NULL for a device without IPv6 configuration, but seg6_hmac_validate_skb() and ipv6_srh_rcv() dereference the returned idev. Reachability requires the SRv6 paths and a device lacking IPv6 configuration, such as after device unregister or with an undersized MTU; the documented consequence is loss of system availability.

The record

CVE
CVE-2026-23442
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=1ababeba4a21f3dba3da3523c670b207fb2feb62 <06413793526251870e20402c39930804f14d59c0
  2. Affected versionversion=1ababeba4a21f3dba3da3523c670b207fb2feb62 <a25853c9feea7bbf31d157ff6e004d2d3b4f7f13
  3. Affected versionversion=4.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1ababeba4a21f3dba3da3523c670b207fb2feb62 <06413793526251870e20402c39930804f14d59c0; version=1ababeba4a21f3dba3da3523c670b207fb2feb62 <a25853c9feea7bbf31d157ff6e004d2d3b4f7f13; version=4.10

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5Amazon LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5Oracle LinuxCVSS:3.1/AV:A/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)
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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