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Vulnerability ID

CVE-2026-31681

Vulnerability in netfilter/xt_multiport

ProductLinux kernel

CVSS 3.1Medium5.5

EPSS0.12%

Has public PoCNo

AI Exploitability

No working AI exploit yet

Working AI PoC: Not yet
Cheapest run: $3.91
Fastest run: —

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Overview

netfilter: xt_multiport: validate range encoding in checkentry ports_match_v1() treats any non-zero pflags entry as the start of a port range and unconditionally consumes the next ports[] element as the range end.

CWE: Unassigned
Weakness: —
Component: netfilter/xt_multiport
Impact: Not stated
Published: 2026-04-25
Fixed version: 7.0

Risk factors

In-the-WildNot observed

CISA KEVNot listed

Public ExploitNone known

Ransomware useNone known

Severity

CVSS 3.1Only version published

5.5Medium

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitability

Attack VectorLocal

ComplexityLow

Privileges RequiredLow

User InteractionNone

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

EPSS

Chance of exploitation in the next 30 days

0.12%

SSVC

Stakeholder-specific vulnerability categorization

Not scored. CISA publishes an SSVC decision for a subset of CVEs.