{"id":4170,"date":"2026-11-05T02:00:46","date_gmt":"2026-11-05T02:00:46","guid":{"rendered":"https:\/\/serverhost.com\/blog\/ubuntu-users-blast-canonical-over-slow-kernel-security-fix\/"},"modified":"2026-11-05T02:00:46","modified_gmt":"2026-11-05T02:00:46","slug":"ubuntu-users-blast-canonical-over-slow-kernel-security-fix","status":"publish","type":"post","link":"https:\/\/serverhost.com\/blog\/ubuntu-users-blast-canonical-over-slow-kernel-security-fix\/","title":{"rendered":"Ubuntu Users Blast Canonical Over Slow Kernel Security Fix"},"content":{"rendered":"<p>Canonical is preparing a fix for a critical Linux kernel vulnerability, but the update has yet to reach Ubuntu\u2019s stable repositories\u2014weeks after Debian and several other distributions patched it.<\/p>\n<p>As of 3 November, patched kernels for Ubuntu 22.04, 24.04 and 26.04 LTS were available for testing, but Canonical had not announced when they would be released to stable users.<\/p>\n<h2>A severe flaw affecting network connections<\/h2>\n<p>Tracked as <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-98432\">CVE-2026-98432<\/a>, the vulnerability is a use-after-free bug in the Linux kernel\u2019s handling of incoming IPv4 TCP connections.<\/p>\n<p>According to <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/access.redhat.com\/security\/vulnerabilities\/RHSB-2026-016\">Red Hat\u2019s security bulletin<\/a>, an attacker could send specially crafted data to a vulnerable machine to crash it, cause a denial-of-service attack or potentially execute code with root privileges.<\/p>\n<p>Servers are considered especially at risk. The bug may have existed since 2016, potentially leaving many Linux servers and cloud systems exposed. The Linux kernel CVE team rates it 9.8 out of 10 on the CVSS 3.1 severity scale, though Oracle and SUSE assign it a lower score of 8.1, citing the difficulty of exploitation.<\/p>\n<p>The researcher who reported the flaw says an unreleased Claude model produced a working exploit that could give a remote attacker root access to vulnerable servers using Multipath TCP (MPTCP). The reported fix is described as a two-line change, adding to users\u2019 frustration that Ubuntu\u2019s update is still in testing while <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/tracker.debian.org\/news\/1811640\/accepted-linux-612113-1-source-into-stable-security\/\">Debian\u2019s patch<\/a> was released weeks earlier.<\/p>\n<h2>Users criticize the delay<\/h2>\n<p>Ubuntu users have publicly criticized Canonical\u2019s response, asking why the fix has taken so long. One developer, in a post titled \u201cWTF Ubuntu,\u201d said they were moving their servers away from Ubuntu because they had lost confidence in it as a secure and reliable platform.<\/p>\n<p>The criticism is notable because Canonical sells enterprise support that emphasizes timely security updates, including through Ubuntu Pro and Extended Security Maintenance.<\/p>\n<p>Canonical says kernel updates are tested across thousands of certified servers and devices before release. Administrators who need the fix sooner can enable the <code>-proposed<\/code> update repository and install the testing kernel. The company has also said that disabling MPTCP is not an appropriate workaround: the vulnerability is not limited to that feature, and a security update is the proper mitigation.<\/p>\n<p>The delay may be connected to Canonical\u2019s newer kernel security update schedule, which uses a fixed testing period intended to improve the release process. In this case, however, users argue that the process has not delivered the fix quickly enough.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Canonical is preparing a fix for a critical Linux kernel vulnerability, but the update has yet to reach Ubuntu\u2019s stable repositories\u2014weeks after Debian and&hellip;<\/p>\n","protected":false},"author":0,"featured_media":4171,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[294,1493,4,249],"tags":[],"class_list":["post-4170","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-canonical","category-cves","category-news","category-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ubuntu Users Blast Canonical Over Slow Kernel Security Fix - ServerHost Hosting Solutions Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/serverhost.com\/blog\/ubuntu-users-blast-canonical-over-slow-kernel-security-fix\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ubuntu Users Blast Canonical Over Slow Kernel Security Fix - 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