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Vulnerability ID

CVE-2026-31427

Uninitialized memory in netfilter/nf_conntrack_sip

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: $8.28
Fastest run: —

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Overview

netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp process_sdp() declares union nf_inet_addr rtp_addr on the stack and passes it to the nf_nat_sip sdp_session hook after walking the SDP media descriptions. However rtp_addr is only initialized inside the media loop when a recognized media type with a non-zero port is found.

CWE: CWE-908
Weakness: Use of Uninitialized Resource
Component: netfilter/nf_conntrack_sip
Impact: Not stated
Published: 2026-04-13
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.