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CVE-2026-31472

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: validate inner IPv4 header length in IPTFS payload Add validation of the inner IPv4 packet tot_len and ihl fields…

Published Apr 22, 2026CWE-835EPSS 0.16%

Overview

CVE-2026-31472 is a medium-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

xfrm: iptfs: validate inner IPv4 header length in IPTFS payload

Add validation of the inner IPv4 packet tot_len and ihl fields parsed

from decrypted IPTFS payloads in __input_process_payload(). A crafted

ESP packet containing an inner IPv4 header with tot_len=0 causes an

infinite loop: iplen=0 leads to capturelen=min(0, remaining)=0, so the

data offset never advances and the while(data < tail) loop never

terminates, spinning forever in softirq context.

Reject inner IPv4 packets where tot_len < ihl*4 or ihl*4 < sizeof(struct

iphdr), which catches both the tot_len=0 case and malformed ihl values.

The normal IP stack performs this validation in ip_rcv_core(), but IPTFS

extracts and processes inner packets before they reach that layer.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0d10393d5eac33cbd92f7a41fddca12c41d3cb7eRefgit.kernel.org/stable/c/3db7d4f777a00164582061ccaa99569cd85011a3Refgit.kernel.org/stable/c/de6d8e8ce5187f7402c9859b443355e7120c5f09

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31472?

CVE-2026-31472 is a medium-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31472?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31472?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31472?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31472 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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