{"id":"CVE-2026-89510","title":"kernel: RDMA/cxgb4: Cancel reg_work before freeing device on remove (CVE-2026-89510)","summary":"A flaw was found in the Linux kernel's RDMA/cxgb4 component. This vulnerability occurs when the `c4iw_remove()` function frees a device while its registration work (`reg_work`) is still pending or actively running. This timing issue can le…","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 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T14:49:03+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89510.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89510.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89510"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532033"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89510"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89510"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89510.mbox"},{"url":"https://git.kernel.org/stable/c/e6e79e7be87c5ea92728060a3d7fb56890a91e45"},{"url":"https://git.kernel.org/stable/c/672ee1981db10569ec96030bddb322f18382ec04"},{"url":"https://git.kernel.org/stable/c/4681e731db07769846901cfabdd3e53f765eb9d3"},{"url":"https://git.kernel.org/stable/c/3265d558dfafab8f12f5fba06ebbf15cae9f3225"},{"url":"https://git.kernel.org/stable/c/fe9c591026c576d8b1f72aab5e4cd67350530763"},{"url":"https://git.kernel.org/stable/c/85f438382a865a4dc4c50e6b884310bb2b60fc4d"},{"url":"https://git.kernel.org/stable/c/320e5258a53af0abc5abd9eb01519a48bab2dee8"},{"url":"https://git.kernel.org/stable/c/a7100601aa1a39f799a566acce10db20eaf4b7f2"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00176,"epssPercentile":0.07368,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89510","body":"## Overview\n\nA flaw was found in the Linux kernel's RDMA/cxgb4 component. This vulnerability occurs when the `c4iw_remove()` function frees a device while its registration work (`reg_work`) is still pending or actively running. This timing issue can lead to the `c4iw_register_device()` function attempting to access memory that has already been deallocated. The primary consequence of this use-after-free vulnerability is system instability, which could potentially lead to 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 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89510.json)\n\n**kernel: RDMA/cxgb4: Cancel reg_work before freeing device on remove** — rated Moderate 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 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":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":202759,"id":"CVE-2026-89510","ts":1789403715746,"field":"cvss","old":"7.8","new":"7"},{"seq":197988,"id":"CVE-2026-89510","ts":1789384321271,"field":"cvss","old":"5.2","new":"7.8"},{"seq":197987,"id":"CVE-2026-89510","ts":1789384321271,"field":"severity","old":"medium","new":"high"},{"seq":183775,"id":"CVE-2026-89510","ts":1789356677337,"field":"cvss","old":"7.8","new":"5.2"},{"seq":183774,"id":"CVE-2026-89510","ts":1789356677337,"field":"severity","old":"high","new":"medium"},{"seq":153302,"id":"CVE-2026-89510","ts":1789285349954,"field":"cvss","old":null,"new":"7.8"},{"seq":153301,"id":"CVE-2026-89510","ts":1789285349954,"field":"severity","old":"none","new":"high"},{"seq":109646,"id":"CVE-2026-89510","ts":1789183732775,"field":"cvss","old":null,"new":"5.2"},{"seq":109645,"id":"CVE-2026-89510","ts":1789183732775,"field":"severity","old":"none","new":"medium"}]}