CVE-2023-2156Network attack vector

Remote kernel crash via RPL header miscalculation

Published May 9, 2023 · Updated Aug 2, 2024

Reachable assertion in the Linux Kernel IPv6 RPL implementation allows remote attackers to crash affected systems with crafted RPL data. The ipv6_rpl_srh_size function omits the fixed eight-byte source-routing header when checking packet length before skb_pull processes untrusted packet data. Exploitation requires network reachability to IPv6 RPL processing and interrupts availability by crashing the kernel.

CVSS severity7.5
High
EPSS probability6.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reachable assertion in the Linux Kernel IPv6 RPL implementation allows remote attackers to crash affected systems with crafted RPL data. The ipv6_rpl_srh_size function omits the fixed eight-byte source-routing header when checking packet length before skb_pull processes untrusted packet data. Exploitation requires network reachability to IPv6 RPL processing and interrupts availability by crashing the kernel.

The record

CVE
CVE-2023-2156
Published
May 9, 2023
Updated
Aug 2, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Reproducible on the latest mainline.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Reproducible on the latest mainline.

Published CVSS scores

7.5Zero Day InitiativeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo