{"id":"CVE-2026-80819","title":"kernel: Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept (CVE-2026-80819)","summary":"A flaw was found in the Bluetooth RFCOMM (Radio Frequency Communication) subsystem of the Linux kernel. A remote attacker can send a specially crafted Bluetooth Disconnect (DISC) message to a device with a deferred RFCOMM channel. This can…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/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 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-04","updated":"2026-10-25","sourceUpdated":"2026-10-25T23:14:19+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80819.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80819.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80819"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528593"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80819"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80819"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80819.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-80819"},{"url":"https://git.kernel.org/stable/c/d8d686dd5662a7c4745e4515f1237a9f3b7df181"},{"url":"https://git.kernel.org/stable/c/eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2"},{"url":"https://git.kernel.org/stable/c/56f0aa75c7640e46397ef73bea251fcbef9150c0"},{"url":"https://git.kernel.org/stable/c/362726c9c6e56eea4262109183e49868c39ccd3a"},{"url":"https://git.kernel.org/stable/c/825b95561d7b7c393df9e7bc295451aaeadc3d18"},{"url":"https://git.kernel.org/stable/c/d4b1a13b1eff2e80925c7368ffdeaaa50cba93df"},{"url":"https://git.kernel.org/stable/c/355bfd57ca4ca881c6eb03ca813b440a094b1f44"},{"url":"https://git.kernel.org/stable/c/b405c2f96ae2e37375105881890f7738833b1d62"},{"url":"https://git.kernel.org/stable/c/43a556b2fd43f2df6dded59c2e26560a27874c24"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00195,"epssPercentile":0.09132,"ingestedAt":"2026-10-19T09:16:01.505Z","slug":"CVE-2026-80819","body":"## Overview\n\nA flaw was found in the Bluetooth RFCOMM (Radio Frequency Communication) subsystem of the Linux kernel. A remote attacker can send a specially crafted Bluetooth Disconnect (DISC) message to a device with a deferred RFCOMM channel. This can lead to a null pointer dereference when the system attempts to process the message, resulting in a kernel crash and a denial of service.\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 2026-10-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80819.json)\n\n**kernel: Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept** — rated Moderate by Red Hat. Released 2026-09-04, updated 2026-10-25.\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\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":229467,"id":"CVE-2026-80819","ts":1793019786857,"field":"cvss","old":null,"new":"6.5"},{"seq":229466,"id":"CVE-2026-80819","ts":1793019786857,"field":"severity","old":"none","new":"medium"}]}