---
id: CVE-2025-71084
title: 'RDMA/cm: Fix leaking the multicast GID table reference'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/cm: Fix leaking the multicast GID table reference

  If the CM ID is destroyed while the CM event for multicast creating is
  still queued the cancel_work_sync() will …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 60d613b39e8d0c9f3b526e9c96445422b4562d76 <
    d5ce588a9552878859a4d44b70b724216c188a5f
  - >-
    Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b <
    abf38398724ecc888f62c678d288da40d11878af
  - >-
    Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b <
    ab668a58c4a2ccb6d54add7a76f2f955d15d0196
  - >-
    Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b <
    c0acdee513239e1d6e1b490f56be0e6837dfd162
  - >-
    Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b <
    5cb34bb5fd726491b809efbeb5cfd63ae5bf9cf3
  - >-
    Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b <
    3ba6d01c4b3c584264dc733c6a2ecc5bbc8e0bb5
  - >-
    Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b <
    57f3cb6c84159d12ba343574df2115fb18dd83ca
  - Linux a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4
  - Linux >= 5.10.20 < 5.10.248
  - Linux >= 5.11.3 < 5.12
  - Linux 5.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:42:17.315950Z'
published: '2026-01-13'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:15:11.601Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-71084'
references:
  - url: 'https://git.kernel.org/stable/c/d5ce588a9552878859a4d44b70b724216c188a5f'
  - url: 'https://git.kernel.org/stable/c/abf38398724ecc888f62c678d288da40d11878af'
  - url: 'https://git.kernel.org/stable/c/ab668a58c4a2ccb6d54add7a76f2f955d15d0196'
  - url: 'https://git.kernel.org/stable/c/c0acdee513239e1d6e1b490f56be0e6837dfd162'
  - url: 'https://git.kernel.org/stable/c/5cb34bb5fd726491b809efbeb5cfd63ae5bf9cf3'
  - url: 'https://git.kernel.org/stable/c/3ba6d01c4b3c584264dc733c6a2ecc5bbc8e0bb5'
  - url: 'https://git.kernel.org/stable/c/57f3cb6c84159d12ba343574df2115fb18dd83ca'
tags:
  - cve.org
epss: 0.00137
epssPercentile: 0.02763
ingestedAt: '2026-10-19T18:35:50.137Z'
---

## Overview

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

RDMA/cm: Fix leaking the multicast GID table reference

If the CM ID is destroyed while the CM event for multicast creating is
still queued the cancel_work_sync() will prevent the work from running
which also prevents destroying the ah_attr. This leaks a refcount and
triggers a WARN:

   GID entry ref leak for dev syz1 index 2 ref=573
   WARNING: CPU: 1 PID: 655 at drivers/infiniband/core/cache.c:809 release_gid_table drivers/infiniband/core/cache.c:806 [inline]
   WARNING: CPU: 1 PID: 655 at drivers/infiniband/core/cache.c:809 gid_table_release_one+0x284/0x3cc drivers/infiniband/core/cache.c:886

Destroy the ah_attr after canceling the work, it is safe to call this
twice.

## Affected

- `Linux >= 60d613b39e8d0c9f3b526e9c96445422b4562d76 < d5ce588a9552878859a4d44b70b724216c188a5f`
- `Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b < abf38398724ecc888f62c678d288da40d11878af`
- `Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b < ab668a58c4a2ccb6d54add7a76f2f955d15d0196`
- `Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b < c0acdee513239e1d6e1b490f56be0e6837dfd162`
- `Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b < 5cb34bb5fd726491b809efbeb5cfd63ae5bf9cf3`
- `Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b < 3ba6d01c4b3c584264dc733c6a2ecc5bbc8e0bb5`
- `Linux >= fe454dc31e84f8c14cb8942fcb61666c9f40745b < 57f3cb6c84159d12ba343574df2115fb18dd83ca`
- `Linux a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4`
- `Linux >= 5.10.20 < 5.10.248`
- `Linux >= 5.11.3 < 5.12`
- `Linux 5.12`

## Remediation

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