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🛡️ CVE-2023-53393 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

RDMA/mlx5: Fix mlx5_ib_get_hw_stats when used for device

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

RDMA/mlx5: Fix mlx5_ib_get_hw_stats when used for device

Currently, when mlx5_ib_get_hw_stats() is used for device (port_num = 0),

there is a special handling in order to use the correct counters, but,

port_num is being passed down the stack without any change. Also, some

functions assume that port_num >=1. As a result, the following oops can

occur.

BUG: unable to handle page fault for address: ffff89510294f1a8

#PF: supervisor write access in kernel mode

#PF: error_code(0x0002) - not-present page

PGD 0 P4D 0

Oops: 0002 [#1] SMP

CPU: 8 PID: 1382 Comm: devlink Tainted: G W 6.1.0-rc4_for_upstream_base_2022_11_10_16_12 #1

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014

RIP: 0010:_raw_spin_lock+0xc/0x20

Call Trace:

<TASK>

mlx5_ib_get_native_port_mdev+0x73/0xe0 [mlx5_ib]

do_get_hw_stats.constprop.0+0x109/0x160 [mlx5_ib]

mlx5_ib_get_hw_stats+0xad/0x180 [mlx5_ib]

ib_setup_device_attrs+0xf0/0x290 [ib_core]

ib_register_device+0x3bb/0x510 [ib_core]

? atomic_notifier_chain_register+0x67/0x80

__mlx5_ib_add+0x2b/0x80 [mlx5_ib]

mlx5r_probe+0xb8/0x150 [mlx5_ib]

? auxiliary_match_id+0x6a/0x90

auxiliary_bus_probe+0x3c/0x70

? driver_sysfs_add+0x6b/0x90

really_probe+0xcd/0x380

__driver_probe_device+0x80/0x170

driver_probe_device+0x1e/0x90

__device_attach_driver+0x7d/0x100

? driver_allows_async_probing+0x60/0x60

? driver_allows_async_probing+0x60/0x60

bus_for_each_drv+0x7b/0xc0

__device_attach+0xbc/0x200

bus_probe_device+0x87/0xa0

device_add+0x404/0x940

? dev_set_name+0x53/0x70

__auxiliary_device_add+0x43/0x60

add_adev+0x99/0xe0 [mlx5_core]

mlx5_attach_device+0xc8/0x120 [mlx5_core]

mlx5_load_one_devl_locked+0xb2/0xe0 [mlx5_core]

devlink_reload+0x133/0x250

devlink_nl_cmd_reload+0x480/0x570

? devlink_nl_pre_doit+0x44/0x2b0

genl_family_rcv_msg_doit.isra.0+0xc2/0x110

genl_rcv_msg+0x180/0x2b0

? devlink_nl_cmd_region_read_dumpit+0x540/0x540

? devlink_reload+0x250/0x250

? devlink_put+0x50/0x50

? genl_family_rcv_msg_doit.isra.0+0x110/0x110

netlink_rcv_skb+0x54/0x100

genl_rcv+0x24/0x40

netlink_unicast+0x1f6/0x2c0

netlink_sendmsg+0x237/0x490

sock_sendmsg+0x33/0x40

__sys_sendto+0x103/0x160

? handle_mm_fault+0x10e/0x290

? do_user_addr_fault+0x1c0/0x5f0

__x64_sys_sendto+0x25/0x30

do_syscall_64+0x3d/0x90

entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fix it by setting port_num to 1 in order to get device status and remove

unused variable.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-53393 is recorded against 2 packages.

  • kernel (from 6.1.0 up to 6.1.5)
  • linux-kernel

Timeline and source

Published on 18 September 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-53393 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-09-18
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.1.0 6.1.5
linux-kernel — —

Similar Threats

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