CVE-2026-72249
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
In the Linux kernel, the netfilter flowtable module has a vulnerability due to using the route from the opposite direction when pushing the IPIP header. This can lead to incorrect headroom calculation and field settings.
Risk Assessment
Incorrect headroom calculation can lead to packet transmission errors, potentially causing a system crash.
Recommendation
Apply a Linux kernel update containing the fix that uses the route from the correct direction when pushing the IPIP header.
Original NVD description (English source)
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->frag_off only at this stage.