---
id: CVE-2026-89535
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id

  svc_rdma_free() caches rdma->sc_cm_id->device before teardown,
  then calls rdma_destroy_id(sc_cm_id) which…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id

  svc_rdma_free() caches rdma->sc_cm_id->device before teardown,
  then calls rdma_destroy_id(sc_cm_id) which…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-825
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <
    fcd4a752ac840d39356f4d2a424d3aca4e39716b
  - >-
    Linux >= c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <
    9f2f5d0999364c7070306cd422d8babc2621070d
  - >-
    Linux >= c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <
    cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9
  - >-
    Linux >= c4de97f7c45434985e5dbf2d6ccc9eca676e37fe <
    4488e912973773d64368828acf3b8e39d93650ae
  - Linux 6.12
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T14:17:22.700'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89535'
references:
  - url: 'https://git.kernel.org/stable/c/4488e912973773d64368828acf3b8e39d93650ae'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9f2f5d0999364c7070306cd422d8babc2621070d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fcd4a752ac840d39356f4d2a424d3aca4e39716b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89535.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89535'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532438'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89535'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89535'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89535.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00568
epssPercentile: 0.44658
scores:
  nvd: 8.1
  cna: 8.1
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id

svc_rdma_free() caches rdma->sc_cm_id->device before teardown,
then calls rdma_destroy_id(sc_cm_id) which frees the cm_id.
rpcrdma_rn_unregister() follows, but between those two calls
the transport's sc_rn entry is still installed in the device's
rd_xa. A concurrent ib_unregister_device walk can dispatch
svc_rdma_xprt_done() against the now-freed sc_cm_id.

Move rpcrdma_rn_unregister() before rdma_destroy_id() so the
transport's notification entry is removed from the xarray before
the cm_id it references is destroyed.

Also guard the sc_cm_id dereference with a NULL check: the
following patches introduce paths that reach svc_rdma_free()
with sc_cm_id == NULL (listener create failure, ADDR_CHANGE
replacement failure).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89535.json)