---
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: 0.02574
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

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 device to trigger a use-after-free vulnerability, potentially leading to system instability or a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89508.json)

**kernel: RDMA/ucma: Lock the handler in ucma_set_ib_path()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Not 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

## Remediation

Refer to the advisory for fix availability.