Ubuntu: (CVE-2026-23408): linux vulnerability

In the Linux kernel, the following vulnerability has been resolved:

apparmor: Fix double free of ns_name in aa_replace_profiles()

if ns_name is NULL after
1071 error = aa_unpack(udata, &lh, &ns_name);

and if ent->ns_name contains an ns_name in
1089 } else if (ent->ns_name) {

then ns_name is assigned the ent->ns_name
1095 ns_name = ent->ns_name;

however ent->ns_name is freed at
1262 aa_load_ent_free(ent);

and then again when freeing ns_name at
1270 kfree(ns_name);

Fix this by NULLing out ent->ns_name after it is transferred to ns_name

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