Improper input validation in Linux kernel - CVE-2026-31472
Published: April 24, 2026
Vulnerability identifier: #VU127679
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31472
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in __input_process_payload() when processing decrypted IPTFS payloads. A remote attacker can send a crafted ESP packet containing a malformed inner IPv4 header to cause a denial of service.
The issue can trigger an infinite loop in softirq context when the inner IPv4 header has tot_len set to 0 or otherwise invalid length fields.
How to mitigate CVE-2026-31472
Install security update from vendor's repository.