Is CVE-2026-53230 actively exploited?

No active exploitation of CVE-2026-53230 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-53230 be exploited remotely?

No. CVE-2026-53230 requires local access to exploit.

What is the CVSS score of CVE-2026-53230?

CVE-2026-53230 has a CVSS score of 8.7 (HIGH).

HOME VULNERABILITIESCVE-2026-53230

HIGH

CVE-2026-53230

Published: June 25, 2026· Updated: Jun 30, 2026

8.7

CVSS v3.1

EPSS:0.18%probability of exploitation in 30 daysPercentile:7.2th

Official Description

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

net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list

mlx5_query_nic_vport_mac_list() sizes its firmware command buffer using

the PF's log_max_current_uc/mc_list capabilities. When querying a VF

vport with a larger configured max (via devlink), the firmware response

can overflow this buffer:

BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core]

Read of size 4 at addr ff1100013ffc8a12 by task kworker/u96:2/385

CPU: 12 UID: 0 PID: 385 Comm: kworker/u96:2 Not tainted 7.0.0-rc6+ #1 PREEMPT

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009)

Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core]

Call Trace:

<TASK>

dump_stack_lvl+0x69/0xa0

print_report+0x176/0x4e4

kasan_report+0xc8/0x100

mlx5_query_nic_vport_mac_list+0x453/0x4c0 [mlx5_core]

esw_update_vport_addr_list+0x2e3/0xda0 [mlx5_core]

esw_vport_change_handle_locked+0xa1f/0x1060 [mlx5_core]

esw_vport_change_handler+0x6a/0x90 [mlx5_core]

process_one_work+0x87f/0x15e0

worker_thread+0x62b/0x1020

kthread+0x375/0x490

ret_from_fork+0x4dc/0x810

ret_from_fork_asm+0x11/0x20

</TASK>

Fix by querying the vport's own HCA caps to size the buffer correctly.

Refactor the function to allocate and return the MAC list internally,

removing the caller's dependency on knowing the correct max.

NVD Source

Technical Analysis

CVE-2026-53230 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 8.7.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.