---
id: CVE-2026-74396
title: 'RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure

  mlx5r_umr_update_xlt() allocates and DMA maps an XLT buffer with
  mlx5r_umr_create_xlt(). The buffer is released …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1efe8c0670d6a6883faa09c9abc746c741f5664a <
    ffa85a2c197935ace6f1634ad9eb0a44bc615670
  - >-
    Linux >= 1efe8c0670d6a6883faa09c9abc746c741f5664a <
    9619909d4869afe720904c6888a289b9ac3055b8
  - >-
    Linux >= 1efe8c0670d6a6883faa09c9abc746c741f5664a <
    1eae35b37923cb71b0cb5136d00671440d488b9f
  - Linux 6.16
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T18:55:21.919337Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:05:41.026Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74396'
references:
  - url: 'https://git.kernel.org/stable/c/ffa85a2c197935ace6f1634ad9eb0a44bc615670'
  - url: 'https://git.kernel.org/stable/c/9619909d4869afe720904c6888a289b9ac3055b8'
  - url: 'https://git.kernel.org/stable/c/1eae35b37923cb71b0cb5136d00671440d488b9f'
tags:
  - cve.org
epss: 0.00732
epssPercentile: 0.53431
ingestedAt: '2026-10-16T19:46:24.370Z'
---

## Overview

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

RDMA/mlx5: Fix UMR XLT cleanup on ODP populate failure

mlx5r_umr_update_xlt() allocates and DMA maps an XLT buffer with
mlx5r_umr_create_xlt(). The buffer is released by the common cleanup path
through mlx5r_umr_unmap_free_xlt().

After mlx5_odp_populate_xlt() became fallible, its error path returned
directly and skipped that cleanup. This leaks the XLT DMA mapping and
buffer. If the emergency XLT page was used, it also leaves
xlt_emergency_page_mutex locked.

Break out of the loop so execution falls through the existing cleanup path.

## Affected

- `Linux >= 1efe8c0670d6a6883faa09c9abc746c741f5664a < ffa85a2c197935ace6f1634ad9eb0a44bc615670`
- `Linux >= 1efe8c0670d6a6883faa09c9abc746c741f5664a < 9619909d4869afe720904c6888a289b9ac3055b8`
- `Linux >= 1efe8c0670d6a6883faa09c9abc746c741f5664a < 1eae35b37923cb71b0cb5136d00671440d488b9f`
- `Linux 6.16`

## Remediation

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