SB20260424259 - Improper input validation in Linux kernel xfrm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-31472)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0d10393d5eac33cbd92f7a41fddca12c41d3cb7e
• https://git.kernel.org/stable/c/3db7d4f777a00164582061ccaa99569cd85011a3
• https://git.kernel.org/stable/c/de6d8e8ce5187f7402c9859b443355e7120c5f09