{"id":"CVE-2026-98772","title":"kernel: USB: serial: fix port tear down use-after-free (CVE-2026-98772)","summary":"A flaw was found in the Linux kernel's USB serial subsystem. This flaw may result in a Denial of Service (DoS) due to a use-after-free vulnerability. During multiport device disconnection, a race condition allows background completion hand…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T08:07:15+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98772.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98772.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98772"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555149"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98772"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98772"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98772.mbox"},{"url":"https://git.kernel.org/stable/c/e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c"},{"url":"https://git.kernel.org/stable/c/60cc9379c3e650d1ebfba4de63f1242537a62a32"},{"url":"https://git.kernel.org/stable/c/5e8980a81af195c49084be5b4c031085b56c7443"},{"url":"https://git.kernel.org/stable/c/e80ee74206f260eb1282e7d1339ff146a4a410d0"},{"url":"https://git.kernel.org/stable/c/33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.05977,"ingestedAt":"2026-10-18T16:47:32.492Z","slug":"CVE-2026-98772","body":"## Overview\n\nA flaw was found in the Linux kernel's USB serial subsystem. This flaw may result in a Denial of Service (DoS) due to a use-after-free vulnerability. During multiport device disconnection, a race condition allows background completion handlers to access port driver data after it has already been freed. A local user or an attacker with physical access could exploit this timing issue during device teardown to trigger a system crash.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98772.json)\n\n**kernel: USB: serial: fix port tear down use-after-free** — 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 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\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\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\nOut of support scope","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228137,"id":"CVE-2026-98772","ts":1792758128306,"field":"cvss","old":null,"new":"4.7"},{"seq":228136,"id":"CVE-2026-98772","ts":1792758128306,"field":"severity","old":"none","new":"medium"}]}