{"id":"CVE-2026-89508","title":"kernel: RDMA/ucma: Lock the handler in ucma_set_ib_path() (CVE-2026-89508)","summary":"A flaw was found in the Linux kernel's RDMA/ucma component. A race condition exists in the `ucma_set_ib_path()` function when handling events concurrently with `ucma_migrate_id()`. This can allow a local attacker with access to an RDMA dev…","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-367","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":"2026-09-18","sourceUpdated":"2026-09-18T21:34:30+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89508.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89508.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89508"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532308"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89508"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89508"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89508.mbox"},{"url":"https://git.kernel.org/stable/c/3dd07b369371a2f29e1c3caf1ade85bb92b4c551"},{"url":"https://git.kernel.org/stable/c/b2da0d488a1c72956ebb0a57015ee8ee6a2f7748"},{"url":"https://git.kernel.org/stable/c/a7f8d26e653ee43b0b572984b8ec544d3b3b6f3c"},{"url":"https://git.kernel.org/stable/c/71dc206f2e2a645dac78879768762451aa1799f7"},{"url":"https://git.kernel.org/stable/c/764586f8f6180084c5a7d622120f526acc6ce0c9"},{"url":"https://git.kernel.org/stable/c/28ac2dd416482d1c763c4af5d61af465b387fb50"},{"url":"https://git.kernel.org/stable/c/43a7d8ae9f645dc00235cfa4bf57673c20b769f8"},{"url":"https://git.kernel.org/stable/c/ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00125,"epssPercentile":0.02577,"scores":{"vendor":5.5,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89508","body":"## Overview\n\nA flaw was found in the Linux kernel's RDMA/ucma component. A race condition exists in the `ucma_set_ib_path()` function when handling events concurrently with `ucma_migrate_id()`. This can allow a local attacker with access to an RDMA device to trigger a use-after-free vulnerability, potentially leading to system instability or a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89508.json)\n\n**kernel: RDMA/ucma: Lock the handler in ucma_set_ib_path()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nNot affected:\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\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206941,"id":"CVE-2026-89508","ts":1789749710176,"field":"cvss","old":"7.8","new":"5.5"},{"seq":206940,"id":"CVE-2026-89508","ts":1789749710176,"field":"severity","old":"high","new":"medium"},{"seq":197986,"id":"CVE-2026-89508","ts":1789384321263,"field":"cvss","old":"4.7","new":"7.8"},{"seq":197985,"id":"CVE-2026-89508","ts":1789384321263,"field":"severity","old":"medium","new":"high"},{"seq":183779,"id":"CVE-2026-89508","ts":1789356677353,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183778,"id":"CVE-2026-89508","ts":1789356677353,"field":"severity","old":"high","new":"medium"},{"seq":153300,"id":"CVE-2026-89508","ts":1789285349945,"field":"cvss","old":null,"new":"7.8"},{"seq":153299,"id":"CVE-2026-89508","ts":1789285349945,"field":"severity","old":"none","new":"high"},{"seq":147402,"id":"CVE-2026-89508","ts":1789270210770,"field":"cvss","old":null,"new":"4.7"},{"seq":147401,"id":"CVE-2026-89508","ts":1789270210770,"field":"severity","old":"none","new":"medium"},{"seq":109162,"id":"CVE-2026-89508","ts":1789183730554,"field":"cvss","old":null,"new":"4.7"},{"seq":109161,"id":"CVE-2026-89508","ts":1789183730554,"field":"severity","old":"none","new":"medium"}]}