---
id: CVE-2026-90218
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cma: Fix WARNING in res_to_rt

  syzbot reported a WARN_ON(!res->dev) in res_to_rt() triggered via
  addr_handler() during asynchronous address resolution:

  "
  WARNING:…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cma: Fix WARNING in res_to_rt

  syzbot reported a WARN_ON(!res->dev) in res_to_rt() triggered via
  addr_handler() during asynchronous address resolution:

  "
  WARNING:…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c5ebaca402f5c5bd61ac8316feb2aa3a0be4d4a8 <
    1d7e55ea64dd15769318ba2e0fe0956db82ba3c3
  - >-
    Linux >= cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <
    39e83bb77fc92344cd62a373b311f096d812e548
  - >-
    Linux >= cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <
    9c80273d663959504957606b9a24fe901ee2a4a1
  - >-
    Linux >= cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <
    2a63cb9ea862ac7d947952b497eef6520853538c
  - >-
    Linux >= cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <
    f72957e0b31f2962f4c1089a9223f1206aa26983
  - >-
    Linux >= cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <
    544e40805dbb6cfe64916bd4c8b238fec585ac2a
  - >-
    Linux >= cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <
    64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5b
  - >-
    Linux >= cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <
    c6d1ec4fbe56492bb88987d577f04a5fb6955f26
  - Linux 073fdf539d4c022162db3d77a5afca1710f0de2d
  - Linux fa37a461bd6d9ee86e891ba3e4074a450e44c881
  - Linux >= 5.10.37 < 5.10.270
  - Linux >= 5.11.21 < 5.12
  - Linux >= 5.12.4 < 5.13
  - Linux 5.13
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:17.137'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90218'
references:
  - url: 'https://git.kernel.org/stable/c/1d7e55ea64dd15769318ba2e0fe0956db82ba3c3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2a63cb9ea862ac7d947952b497eef6520853538c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/39e83bb77fc92344cd62a373b311f096d812e548'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/544e40805dbb6cfe64916bd4c8b238fec585ac2a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9c80273d663959504957606b9a24fe901ee2a4a1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c6d1ec4fbe56492bb88987d577f04a5fb6955f26'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f72957e0b31f2962f4c1089a9223f1206aa26983'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.855Z'
epss: 0.0021
epssPercentile: 0.11546
---

## Overview

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

RDMA/cma: Fix WARNING in res_to_rt

syzbot reported a WARN_ON(!res->dev) in res_to_rt() triggered via
addr_handler() during asynchronous address resolution:

"
WARNING: drivers/infiniband/core/restrack.c:138 at res_to_rt+0x1c4/0x230
CPU#1: kworker/u8:4/59
Modules linked in:
CPU: 1 UID: 0 PID: 59 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Compute Engine, BIOS Google 07/24/2026
Workqueue: ib_addr process_one_req
RIP: 0010:res_to_rt+0x1c4/0x230 drivers/infiniband/core/restrack.c:138
RSP: 0018:ffffc9000201f850 EFLAGS: 00010293
RAX: ffffffff88d00ce5 RBX: ffff88807f0fd4f8 RCX: ffff88801e6e0000
RDX: 0000000000000000 RSI: ffffffff8fd996f0 RDI: 0000000000000003
RBP: 0000000000000000 R08: ffff88801e6e0000 R09: 000000000000000a
R10: 0000000000000009 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff1100fe1fa9f R14: 0000000000000000 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff888125012000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001d559c3d2000 CR3: 0000000077c4c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rdma_restrack_add+0x5a/0x8a0 drivers/infiniband/core/restrack.c:236
 addr_handler+0x41a/0x5a0 drivers/infiniband/core/cma.c:3534
 process_one_req+0x2eb/0x540 drivers/infiniband/core/addr.c:624
 process_one_work kernel/workqueue.c:3375 [inline]
 process_scheduled_works+0xc4e/0x1630 kernel/workqueue.c:3458
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3539
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
"

In addr_handler(), cma_acquire_dev_by_src_ip() is called to populate
id_priv->cma_dev and bind the associated ib_device to id_priv->id.device.
If cma_acquire_dev_by_src_ip() returns an error (non-zero status), the ID
remains unassociated with any RDMA device.

Previously, rdma_restrack_add(&id_priv->res) was invoked unconditionally
even when cma_acquire_dev_by_src_ip() failed, passing a resource with a
NULL dev pointer and triggering the WARN_ON assertion in res_to_rt().

Fix this by only adding the resource to restrack when acquiring the device
succeeds.

## Remediation

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