Ubuntu has not yet released official kernel packages to address CVE-2026-98432, a critical Linux kernel vulnerability with a CVSS score of 9.8. This lack of a vendor update affects the 22.04, 24.04, and 26.04 Long Term Support (LTS) releases. The vulnerability is particularly significant for operators of internet-facing or multi-tenant self-hosted systems, as these environments rely on the Ubuntu kernel to maintain isolation and privilege boundaries. Until an official patch is deployed, these systems remain potentially exposed to the remote or local attacks enabled by the CVE.
While the vulnerability is critical, the specific reason for Ubuntu's delay in releasing a fix remains unknown, as the company has not provided an official explanation or an estimated time of arrival (ETA) for the update. This delay stands in contrast to other distributions; for instance, commenters on Hacker News noted that Gentoo-based systems had already patched the vulnerability. The absence of a vendor-provided fix places the burden on system administrators to decide whether to remain on the current stock kernel, seek out-of-tree mitigations, or migrate workloads to different releases or kernels that already include the patch.
In the absence of official guidance from Ubuntu, the community has discussed various unofficial workarounds. One commenter on Hacker News suggested using `iptables` to drop specific traffic as a potential mitigation, though such measures are not official vendor recommendations. Other participants in the discussion highlighted the risks of running unnecessary services on open ports and emphasized the importance of maintaining a strict firewall. However, because the vulnerability is a kernel-level issue, the effectiveness of these external mitigations varies, and the primary risk remains the lack of a verified, official fix from the distribution maintainers.