{"id":"CVE-2026-89737","title":"kernel: usb: typec: thunderbolt: Disable work before freeing tbt on remove (CVE-2026-89737)","summary":"A flaw was found in the Linux kernel's USB Type-C Thunderbolt driver. The `tbt_altmode_remove()` function fails to properly disable and drain work items before freeing associated plug and cable references. This oversight can lead to a use-…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T17:28:09+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89737.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89737.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89737"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532239"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89737"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89737"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89737.mbox"},{"url":"https://git.kernel.org/stable/c/0a25484fe22f621e151367a59a82330a22ac80bc"},{"url":"https://git.kernel.org/stable/c/92090f6ff2acc81e9dd99881dcfb4f8c1bdaabd3"},{"url":"https://git.kernel.org/stable/c/ebb840d982a612261cfc8a7687735a140c6c7024"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00166,"epssPercentile":0.06263,"ingestedAt":"2026-09-14T11:11:19.885Z","slug":"CVE-2026-89737","body":"## Overview\n\nA flaw was found in the Linux kernel's USB Type-C Thunderbolt driver. The `tbt_altmode_remove()` function fails to properly disable and drain work items before freeing associated plug and cable references. This oversight can lead to a use-after-free vulnerability, where the system attempts to access memory that has already been released. A local attacker could potentially exploit this to cause a system crash, leading to a denial of service, or possibly achieve arbitrary code execution.\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 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89737.json)\n\n**kernel: usb: typec: thunderbolt: Disable work before freeing tbt on remove** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.\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 OpenShift Container Platform 4\n\n## Remediation\n\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204043,"id":"CVE-2026-89737","ts":1789490231172,"field":"cvss","old":null,"new":"7"},{"seq":204042,"id":"CVE-2026-89737","ts":1789490231172,"field":"severity","old":"none","new":"high"},{"seq":147506,"id":"CVE-2026-89737","ts":1789270211175,"field":"cvss","old":null,"new":"7"},{"seq":147505,"id":"CVE-2026-89737","ts":1789270211175,"field":"severity","old":"none","new":"high"},{"seq":109256,"id":"CVE-2026-89737","ts":1789183731167,"field":"cvss","old":null,"new":"7"},{"seq":109255,"id":"CVE-2026-89737","ts":1789183731167,"field":"severity","old":"none","new":"high"}]}