---
id: CVE-2026-90423
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/rxe: Fix UAF in ODP init error-handling path

  rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before
  calling rxe_odp_init_pages()
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/rxe: Fix UAF in ODP init error-handling path

  rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before
  calling rxe_odp_init_pages(). If rxe_odp_init_pages(…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 <
    5f1933163327c9f1c8f2a341c6cb551aaf231ff9
  - >-
    Linux >= d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 <
    4cfb448705da3171d44d9cbe7be53ff03284d532
  - >-
    Linux >= d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 <
    51f2c8d2c99fc1f452f7113c08a35edcc4bf8732
  - Linux 6.15
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:58.663'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90423'
references:
  - url: 'https://git.kernel.org/stable/c/4cfb448705da3171d44d9cbe7be53ff03284d532'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f1933163327c9f1c8f2a341c6cb551aaf231ff9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00173
epssPercentile: 0.05902
ingestedAt: '2026-09-17T16:21:47.793Z'
---

## Overview

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

RDMA/rxe: Fix UAF in ODP init error-handling path

rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before
calling rxe_odp_init_pages(). If rxe_odp_init_pages() fails,
rxe_odp_mr_init_user() releases umem_odp and returns an error.

rxe_reg_user_mr() then unwinds the error through rxe_cleanup(),
rxe_mr_cleanup(), ib_umem_release(mr->umem). There is an
IS_ERR_OR_NULL(umem) check at the start of ib_umem_release().
But since mr->umem is NOT reset to NULL in the error handling
path of rxe_odp_mr_init_user(), the check passes and it reads
already-freed fields like umem->is_dmabuf, causing UAF.

Fix the UAF by clearing mr->umem after releasing the failed
ODP umem so the MR cleanup path does not release it again.

## Remediation

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