---
id: CVE-2026-92508
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/core: Fix potential use after free in ib_free_cq()

  When accessing a CQ via the netlink path the only synchronization
  mechanism for the said CQ is rdma_restrack_ge…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/core: Fix potential use after free in ib_free_cq()

  When accessing a CQ via the netlink path the only synchronization
  mechanism for the said CQ is rdma_restrack_ge…
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 >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 <
    a804b162f9bc2b38b2ed1b4752eea9faadb1645b
  - >-
    Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 <
    91f8a17a22ab615a03743120e19935e731f28fb9
  - >-
    Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 <
    76f2cb4f721815c3b6262a6dc2151de88646924c
  - >-
    Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 <
    b8dcca427096fc9c50f1b376847fea72bc842d31
  - >-
    Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 <
    9abea37942534eeb049335476178696b654b000c
  - >-
    Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 <
    43403fe45379c64fa6276e5a8ede44493e5d2d3d
  - >-
    Linux >= 43d781b9fa562f0c6e50f62c870fbfeb9dc85213 <
    29dc2f8e1c97372c2871a70088707933515fbd5b
  - Linux 7ac277a01f9017fcde4f3f81670c995992945433
  - Linux 093f87dda065e0f618dd577985eccbe85efb9b54
  - Linux >= 5.8.17 < 5.9
  - Linux >= 5.9.2 < 5.10
  - Linux 5.10
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:18:13.500'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92508'
references:
  - url: 'https://git.kernel.org/stable/c/29dc2f8e1c97372c2871a70088707933515fbd5b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/43403fe45379c64fa6276e5a8ede44493e5d2d3d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/76f2cb4f721815c3b6262a6dc2151de88646924c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/91f8a17a22ab615a03743120e19935e731f28fb9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9abea37942534eeb049335476178696b654b000c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a804b162f9bc2b38b2ed1b4752eea9faadb1645b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b8dcca427096fc9c50f1b376847fea72bc842d31'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.0016
epssPercentile: 0.05539
ingestedAt: '2026-09-17T16:21:47.780Z'
---

## Overview

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

RDMA/core: Fix potential use after free in ib_free_cq()

When accessing a CQ via the netlink path the only synchronization
mechanism for the said CQ is rdma_restrack_get().
Currently, rdma_restrack_del() is invoked at the end of
ib_free_cq(), which is too late, since by that point
vendor-specific resources associated with the CQ might already be
freed. This can leave a short window where the CQ remains accessible
through restrack, leading to a potential use-after-free.

Fix this by moving the rdma_restrack_del() call to be before the freeing
of the vendor-specific resources ensuring that the CQ is removed from
restrack before its internal resources are released.
This guarantees that no new users hold references to a CQ that is in
the process of destruction.

## Remediation

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