{"id":"CVE-2026-98747","title":"kernel: serial: core: fix NULL pointer dereference in serial_core_unregister_port() (CVE-2026-98747)","summary":"A flaw was found in the Linux kernel's serial core subsystem. This flaw allows a local user with administrative access to cause a Denial of Service (DoS) by crashing the system. The issue occurs during the unregistration of a serial port t…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-476","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T03:39:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98747.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98747.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98747"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555181"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98747"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98747"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98747.mbox"},{"url":"https://git.kernel.org/stable/c/54abbb862366dcaf1f22f1e968358147b7d0547d"},{"url":"https://git.kernel.org/stable/c/499485a67fbacf4d9afbdb43522388c64f853428"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00155,"epssPercentile":0.0462,"ingestedAt":"2026-10-18T16:47:32.501Z","slug":"CVE-2026-98747","body":"## Overview\n\nA flaw was found in the Linux kernel's serial core subsystem. This flaw allows a local user with administrative access to cause a Denial of Service (DoS) by crashing the system. The issue occurs during the unregistration of a serial port that failed during initial setup or was previously torn down, causing the kernel to improperly access an empty memory address (NULL pointer dereference). This invalid access triggers a kernel crash, disrupting system availability.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98747.json)\n\n**kernel: serial: core: fix NULL pointer dereference in serial_core_unregister_port()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228200,"id":"CVE-2026-98747","ts":1792758181396,"field":"cvss","old":null,"new":"4.4"},{"seq":228199,"id":"CVE-2026-98747","ts":1792758181396,"field":"severity","old":"none","new":"medium"}]}