{"id":"CVE-2026-98739","title":"kernel: Bluetooth: RFCOMM: Fix initial port reference race (CVE-2026-98739)","summary":"A flaw was found in the Linux kernel's Bluetooth RFCOMM subsystem. A local user could exploit this flaw to cause a Denial of Service (DoS) or potentially escalate privileges. A race condition between concurrent device installation and rele…","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-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":"2026-10-23T01:35:34+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98739.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98739.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98739"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555051"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98739"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98739"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98739.mbox"},{"url":"https://git.kernel.org/stable/c/55d162aa00d1ee33c3e6fa88b71f1e2d6e1441e9"},{"url":"https://git.kernel.org/stable/c/a03ccf1ab77380d4c4a3c56552e12de4a83efa21"},{"url":"https://git.kernel.org/stable/c/0a554901bd227537f79220443b2b36d585d62893"},{"url":"https://git.kernel.org/stable/c/e5aa7fbf7a4446bb89f0b8394b2dfc1a6b6aba5b"},{"url":"https://git.kernel.org/stable/c/2d696c1ed3468dcb62578a3911e687110d463520"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.05976,"ingestedAt":"2026-10-18T16:47:32.504Z","slug":"CVE-2026-98739","body":"## Overview\n\nA flaw was found in the Linux kernel's Bluetooth RFCOMM subsystem. A local user could exploit this flaw to cause a Denial of Service (DoS) or potentially escalate privileges. A race condition between concurrent device installation and release operations allows reference counts to be dropped prematurely, resulting in a use-after-free condition and 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-2026-98739.json)\n\n**kernel: Bluetooth: RFCOMM: Fix initial port reference race** — 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":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228220,"id":"CVE-2026-98739","ts":1792758206663,"field":"cvss","old":null,"new":"4.4"},{"seq":228219,"id":"CVE-2026-98739","ts":1792758206663,"field":"severity","old":"none","new":"medium"}]}