{"id":"CVE-2026-80990","title":"kernel: net: thunderbolt: Release the Rx HopID that was handed out on mismatch (CVE-2026-80990)","summary":"A flaw was found in the Linux kernel's Thunderbolt networking driver. An issue in the `tbnet_connected_work()` function can lead to a resource leak. When an unexpected HopID is allocated during an XDomain connection, the ID is not properly…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-772","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T20:06:38+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80990.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80990.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80990"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532275"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80990"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80990"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80990.mbox"},{"url":"https://git.kernel.org/stable/c/47981eb66461ba4e74bbaea0f139adaaeb3991e9"},{"url":"https://git.kernel.org/stable/c/9eac1817bfc5fa76e3a2d1b8fd824cc6ef5a9ab0"},{"url":"https://git.kernel.org/stable/c/61ff3c353e5d2ff4eb9d0b6d8d9e47805b136eea"},{"url":"https://git.kernel.org/stable/c/1c361f6cf39be7cc0ce37c0b67bd1cdf74b0a0c1"},{"url":"https://git.kernel.org/stable/c/2f1463554d0561a2fead81e3888604e5c1125e29"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00209,"epssPercentile":0.09801,"ingestedAt":"2026-09-14T15:23:07.454Z","slug":"CVE-2026-80990","body":"## Overview\n\nA flaw was found in the Linux kernel's Thunderbolt networking driver. An issue in the `tbnet_connected_work()` function can lead to a resource leak. When an unexpected HopID is allocated during an XDomain connection, the ID is not properly released, causing it to remain active without a reference. This resource mismanagement could potentially lead to a Denial of Service (DoS) over time.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80990.json)\n\n**kernel: net: thunderbolt: Release the Rx HopID that was handed out on mismatch** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\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 10\n- Red Hat Enterprise Linux 8\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\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204154,"id":"CVE-2026-80990","ts":1789490233823,"field":"cvss","old":null,"new":"5.5"},{"seq":204153,"id":"CVE-2026-80990","ts":1789490233823,"field":"severity","old":"none","new":"medium"},{"seq":147540,"id":"CVE-2026-80990","ts":1789270211308,"field":"cvss","old":null,"new":"4.8"},{"seq":147539,"id":"CVE-2026-80990","ts":1789270211308,"field":"severity","old":"none","new":"medium"},{"seq":109292,"id":"CVE-2026-80990","ts":1789183731307,"field":"cvss","old":null,"new":"4.8"},{"seq":109291,"id":"CVE-2026-80990","ts":1789183731307,"field":"severity","old":"none","new":"medium"}]}