CVE-2026-72253
Received Received - Intake

BaseFortify

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: validate skb_dst() before accessing it tc ingress and openvswitch do not guarantee routing information to be available. These subsystems use the conntrack helper infrastructure, and the SIP helper relies on the skb_dst() to be present if sip_external_media is set to 1 (which is disabled by default as a module parameter). This effectively disables the sip_external_media toggle for these subsystems without resulting in a crash.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-72253
EUVD
EUVD-2026-59152

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves the SIP (Session Initiation Protocol) connection tracking helper. The issue occurs when the skb_dst() function is accessed without validation in certain network subsystems like tc ingress and openvswitch. These subsystems do not ensure routing information is available, which can lead to potential issues when the sip_external_media parameter is enabled. The vulnerability is mitigated by default as sip_external_media is disabled by default.

Impact Analysis

If exploited, this vulnerability could allow an attacker to disrupt SIP-based services or cause unexpected behavior in network traffic handling. However, the impact is limited because sip_external_media is disabled by default, reducing the risk of exploitation in most environments.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the vulnerability in the nf_conntrack_sip module.

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