CVE-2026-31472: Linux kernel · xfrm: iptfs: validate inner IPv4 header length in IPTFS payload
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 12 Nov 2026, 03:35 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 22 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to validate inner IPv4 header length fields in IPTFS payloads, preventing the infinite loop. Users should apply the official Linux kernel updates that include this patch to mitigate the vulnerability. Since this is a kernel-level fix, upgrading to a patched kernel version is the recommended remediation.
Description
A vulnerability in the Linux kernel IPTFS implementation allows crafted ESP packets with malformed inner IPv4 headers to cause an infinite loop in softirq context. This occurs due to missing validation of the inner IPv4 header length fields in decrypted IPTFS payloads, leading to a non-advancing data offset and a never-ending loop. The issue has been resolved by adding validation checks on the inner IPv4 packet total length and header length fields.