---
id: CVE-2026-92512
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/core: Fix use after free in ib_query_qp()

  When querying a QP via the netlink flow the only synchronization
  mechanism for the said QP is rdma_restrack_get(), meanw…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/core: Fix use after free in ib_query_qp()

  When querying a QP via the netlink flow the only synchronization
  mechanism for the said QP is rdma_restrack_get(), meanw…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 514aee660df493cd673154a6ba6bab745ec47b8c <
    2ef2ea52ae41bd9efa83139e97ae839de7e17156
  - >-
    Linux >= 514aee660df493cd673154a6ba6bab745ec47b8c <
    a608af8cde3dd38936b356bbdeedea0653a05b3f
  - >-
    Linux >= 514aee660df493cd673154a6ba6bab745ec47b8c <
    8998829739c31fdbc892078e4449887d902e5dc9
  - >-
    Linux >= 514aee660df493cd673154a6ba6bab745ec47b8c <
    038cf231b7099ba6202dcc0c1ea01525122df09f
  - >-
    Linux >= 514aee660df493cd673154a6ba6bab745ec47b8c <
    001383248e5d754bbddb7ae2a8573bc8501c85d8
  - >-
    Linux >= 514aee660df493cd673154a6ba6bab745ec47b8c <
    709ba0e5311bd034eb4d9c1c00cc4e1109d6dc3e
  - Linux 5.15
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:53.990'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92512'
references:
  - url: 'https://git.kernel.org/stable/c/001383248e5d754bbddb7ae2a8573bc8501c85d8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/038cf231b7099ba6202dcc0c1ea01525122df09f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2ef2ea52ae41bd9efa83139e97ae839de7e17156'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/709ba0e5311bd034eb4d9c1c00cc4e1109d6dc3e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8998829739c31fdbc892078e4449887d902e5dc9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a608af8cde3dd38936b356bbdeedea0653a05b3f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.779Z'
epss: 0.00215
epssPercentile: 0.10518
---

## Overview

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

RDMA/core: Fix use after free in ib_query_qp()

When querying a QP via the netlink flow the only synchronization
mechanism for the said QP is rdma_restrack_get(), meanwhile during the
QP destroy path rdma_restrack_del() is called at the end of the
ib_destroy_qp_user() function which is too late, since by then the
vendor specific resources for said QP would already be destroyed, and
till the rdma_restrack_del() is called this QP can still be accessed,
which could cause the use after free below.

Fix this by moving the rdma_restrack_begin_del() to the start of the
ib_destroy_qp_user(), which in turn waits for all usages of the QP to be
done then removes it from the database to prevent access to it while it
is being destroyed.

RIP: 0010:ib_query_qp+0x15/0x50 [ib_core]
Code: 48 83 05 5d 8e b9 ff 01 eb b5 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 c7 46 40 00 00 00 00 48 c7 46 78 00 00 00 00 <48> 8b 07 48 8b 80 88 01 00 00 48 85 c0 74 1a 48 83 05 54 91 b9 ff
RSP: 0018:ff11000108a8f2f0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ff11000108a8f370 RCX: ff11000108a8f370
RDX: 0000000000000000 RSI: ff11000108a8f3d8 RDI: 0000000000000000
RBP: ff1100010de5a000 R08: 0000000000000e80 R09: 0000000000000004
R10: ff110001057a604c R11: 0000000000000000 R12: ff11000108a8f370
R13: ff110001090e8000 R14: 0000000000000000 R15: ff110001057a602c
FS:  00007f2ffd8db6c0(0000) GS:ff110008dc90b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010b9a7004 CR4: 0000000000373eb0
Call Trace:
 <TASK>
 mlx5_ib_gsi_query_qp+0x21/0x50 [mlx5_ib]
 mlx5_ib_query_qp+0x689/0x9d0 [mlx5_ib]
 ib_query_qp+0x35/0x50 [ib_core]
 fill_res_qp_entry_query.isra.0+0x47/0x280 [ib_core]
 ? __wake_up+0x40/0x50
 ? netlink_broadcast_filtered+0x15a/0x550
 ? kobject_uevent_env+0x562/0x710
 ? ep_poll_callback+0x242/0x270
 ? __nla_put+0xc/0x20
 ? nla_put+0x28/0x40
 ? nla_put_string+0x2e/0x40 [ib_core]
 fill_res_qp_entry+0x138/0x190 [ib_core]
 res_get_common_dumpit+0x4a5/0x800 [ib_core]
 ? fill_res_qp_entry_query.isra.0+0x280/0x280 [ib_core]
 nldev_res_get_qp_dumpit+0x1e/0x30 [ib_core]
 netlink_dump+0x16f/0x450
 __netlink_dump_start+0x1ce/0x2e0
 rdma_nl_rcv_msg+0x1d3/0x330 [ib_core]
 ? nldev_res_get_qp_raw_dumpit+0x30/0x30 [ib_core]
 rdma_nl_rcv_skb.constprop.0.isra.0+0x108/0x180 [ib_core]
 rdma_nl_rcv+0x12/0x20 [ib_core]
 netlink_unicast+0x255/0x380
 ? __alloc_skb+0xfa/0x1e0
 netlink_sendmsg+0x1f3/0x420
 __sock_sendmsg+0x38/0x60
 ____sys_sendmsg+0x1e8/0x230
 ? copy_msghdr_from_user+0xea/0x170
 ___sys_sendmsg+0x7c/0xb0
 ? __futex_wait+0x95/0xf0
 ? __futex_wake_mark+0x40/0x40
 ? futex_wait+0x67/0x100
 ? futex_wake+0xac/0x1b0
 __sys_sendmsg+0x5f/0xb0
 do_syscall_64+0x55/0xb90
 entry_SYSCALL_64_after_hwframe+0x4b/0x53

## Remediation

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