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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-53230] Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list

This high-severity Red Hat Linux advisory covers CVE-2026-53230 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-53230 Source published Source updated

VulniPulse record published Record updated

CVE-2026-53230
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

Summary

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: 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 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.

Is CVE-2026-53230 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53230 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-53230?

Upgrade to a fixed release named by Red Hat:

  • kernel-rt-0:4.18.0-553.171.1.rt7.512.el8_10
  • kernel-0:4.18.0-553.171.1.el8_10
  • RHSA-2026:75746
  • RHSA-2026:75747

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Fixed versions
  • kernel-rt-0:4.18.0-553.171.1.rt7.512.el8_10
  • kernel-0:4.18.0-553.171.1.el8_10
  • RHSA-2026:75746
  • RHSA-2026:75747

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-rt-0:4.18.0-553.171.1.rt7.512.el8_10, kernel-0:4.18.0-553.171.1.el8_10, RHSA-2026:75746, RHSA-2026:75747. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

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