UBUNTU-CVE-2026-98857: Medium severity ubuntu/linux vulnerability

In the Linux kernel, the following vulnerability has been resolved: ipvs: bound LBLCR and LBLC cache growth ipvslblcrnew() and ipvslblcnew() create cache entries for every previously unseen destination address. The table maxsize only tells the periodic collector to reclaim entries after the cache has already exceeded the limit. It does not reclaim entries that the attacker continues to use. Reject new cache entries once either table reaches maxsize 3 / 2. The extra headroom lets the periodic collector catch up while the existing scheduler fallback continues to use the selected destination when cache creation fails. New traffic therefore stays serviceable without growing the tables further.