CVE-2026-72249: netfilter: flowtable: use dst in this direction when pushing IPIP header
In the Linux kernel, the following vulnerability has been resolved:
netfilter: flowtable: use dst in this direction when pushing IPIP header
When pushing the IPIP header, the route of the other direction is used to calculate the headroom, use the route in this direction. Accessing the other tuple to set the IP source and destination is fine because this tuple does not provide such information to avoid storing redundant information. However, this tuple already provides the dst for this direction, this went unnoticed because this bug affects headroom and iph->fragoff only at this stage.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72249?
CVE-2026-72249 has a risk rating of 27, indicating a moderate severity.
How do I fix CVE-2026-72249?
To resolve CVE-2026-72249, ensure that you update to the patched version of the Linux kernel that addresses this vulnerability.
What systems are affected by CVE-2026-72249?
CVE-2026-72249 affects systems running vulnerable versions of the Linux kernel that utilize the netfilter flowtable functionality.
What type of vulnerability is CVE-2026-72249?
CVE-2026-72249 is a vulnerability associated with incorrect handling of routing in the netfilter framework when pushing IPIP headers.
Is CVE-2026-72249 exploitable?
While there may be a potential exploit vector, exploitation would require specific conditions related to network traffic and kernel configurations.