Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: validate inner IPv4 header length in IPTFS payload Add validation of the inner IPv4 packet tot_len and ihl fields parsed from decrypted IPTFS payloads in __input_process_payload(). A crafted ESP packet containing an inner IPv4 header with tot_len=0 causes an infinite loop: iplen=0 leads to capturelen=min(0, remaining)=0, so the data offset never advances and the while(data < tail) loop never terminates, spinning forever in softirq context. Reject inner IPv4 packets where tot_len < ihl*4 or ihl*4 < sizeof(struct iphdr), which catches both the tot_len=0 case and malformed ihl values. The normal IP stack performs this validation in ip_rcv_core(), but IPTFS extracts and processes inner packets before they reach that layer.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.14.1, < 6.18.21 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0d10393d5eac33cbd92f7a41fddca12c41d3cb7ePatch
- https://git.kernel.org/stable/c/3db7d4f777a00164582061ccaa99569cd85011a3Patch
- https://git.kernel.org/stable/c/de6d8e8ce5187f7402c9859b443355e7120c5f09Patch
FAQ
What is CVE-2026-31472?
CVE-2026-31472 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: validate inner IPv4 header length in IPTFS payload Add validation of the inner IPv4 packet tot_len and ihl fields par...
How severe is CVE-2026-31472?
CVE-2026-31472 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31472?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.