{"id":"CVE-2026-98736","title":"kernel: Bluetooth: hci_conn: Lock parent access during enhanced SCO setup (CVE-2026-98736)","summary":"A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition occurs during enhanced Synchronous Connection-Oriented (SCO) link setup due to missing locking when accessing parent connection structures. A local user or adjace…","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 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T01:35:32+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98736.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98736.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98736"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555090"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98736"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98736"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98736.mbox"},{"url":"https://git.kernel.org/stable/c/70b55855eecb428d446344d827bda8725ce8b312"},{"url":"https://git.kernel.org/stable/c/1239ef0fa809b5952fca679db3faa3e1c00e1dac"},{"url":"https://git.kernel.org/stable/c/cabd58d9bb66d49d481f762ce986173db397435d"},{"url":"https://git.kernel.org/stable/c/93a737e4e042f59673cd580d35214f278d7b757d"},{"url":"https://git.kernel.org/stable/c/024e05f73a4c1263d031614bc36700ec135eecb4"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.05968,"ingestedAt":"2026-10-18T16:47:32.504Z","slug":"CVE-2026-98736","body":"## Overview\n\nA flaw was found in the Linux kernel's Bluetooth subsystem. A race condition occurs during enhanced Synchronous Connection-Oriented (SCO) link setup due to missing locking when accessing parent connection structures. A local user or adjacent attacker could exploit this timing window by concurrently disconnecting the link, causing a use-after-free condition. This flaw could lead to a Denial of Service (DoS) via a system crash or potentially arbitrary code execution.\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 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, 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-2026-98736.json)\n\n**kernel: Bluetooth: hci_conn: Lock parent access during enhanced SCO setup** — 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 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 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\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":228224,"id":"CVE-2026-98736","ts":1792758207783,"field":"cvss","old":null,"new":"4.7"},{"seq":228223,"id":"CVE-2026-98736","ts":1792758207783,"field":"severity","old":"none","new":"medium"}]}