[LTP] cve: add pwnescape reproducer

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On Tue, 20 Oct 2026, Andrea Cervesato wrote:
> cve: add pwnescape reproducer

> +	.tags = (const struct tst_tag[]) {
> +		{"linux-git", "6785011f8b16"},
> +		{}
> +	},

Add {"CVE", "2026-99999"} to .tags in testcases/cve/pwnescape.c.
Without it, metadata extraction assigns only the regression group, so
CVE-based metadata selection and the generated CVE catalog omit this test;
the runtest/cve entry does not populate that metadata.

Runtime verification was blocked by unshare(CLONE_NEWUSER) returning
EPERM in this environment, before the forwarding behavior was exercised.

Verdict - Needs revision

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