linux-yocto/6.18: update CVE exclusions (6.18.8)

linux-yocto/6.18: update CVE exclusions (6.18.8)

Data pulled from: https://github.com/CVEProject/cvelistV5

    1/1 [
        Author: cvelistV5 Github Action
        Email: github_action@example.com
        Subject: 1 changes (1 new | 0 updated): - 1 new CVEs: CVE-2026-1896 - 0 updated CVEs:
        Date: Wed, 4 Feb 2026 23:41:08 +0000

    ]

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>