---
id: CVE-2026-53188
title: 'RDMA/core: Validate the passed in fops for ib_get_ucaps()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/core: Validate the passed in fops for ib_get_ucaps()

  Sashiko pointed out it is not safe to rely only on the devt because
  char/block alias so if the user finds a b…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 61e51682816d395307f78ae06d640089054c28ab <
    96b6e98ff12d50ed5817230c6f1188e1150d225d
  - >-
    Linux >= 61e51682816d395307f78ae06d640089054c28ab <
    aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b
  - >-
    Linux >= 61e51682816d395307f78ae06d640089054c28ab <
    4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee
  - Linux 6.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:26:27.618185Z'
published: '2026-06-25'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:31:35.863Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53188'
references:
  - url: 'https://git.kernel.org/stable/c/96b6e98ff12d50ed5817230c6f1188e1150d225d'
  - url: 'https://git.kernel.org/stable/c/aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b'
  - url: 'https://git.kernel.org/stable/c/4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee'
tags:
  - cve.org
epss: 0.00127
epssPercentile: 0.02132
ingestedAt: '2026-10-16T17:24:46.734Z'
---

## Overview

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

RDMA/core: Validate the passed in fops for ib_get_ucaps()

Sashiko pointed out it is not safe to rely only on the devt because
char/block alias so if the user finds a block device with the same dev_t
it can masquerade as a ucap cdev fd.

Test the f_ops to only accept authentic cdevs.

## Affected

- `Linux >= 61e51682816d395307f78ae06d640089054c28ab < 96b6e98ff12d50ed5817230c6f1188e1150d225d`
- `Linux >= 61e51682816d395307f78ae06d640089054c28ab < aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b`
- `Linux >= 61e51682816d395307f78ae06d640089054c28ab < 4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee`
- `Linux 6.15`

## Remediation

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