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Vulnerability · Published Jun 25, 2026 · Assigned by Linux

CVE-2026-53230net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list

High 8.7

In plain English

A high-severity out-of-bounds write in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.7High
Exploit odds (30 days)0.1%top 97.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-abi-stablelists4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-core4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-cross-headers4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-debug4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-debug-core4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-debug-devel4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-debug-modules4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-devel4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-doc4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-headers4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-modules4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-modules-extra4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-rt4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-core4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-debug4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-debug-core4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-devel4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-modules4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.171.1.rt7.512.el8_10ALSA-2026:75746
AlmaLinux:8kernel-tools4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-tools-libs4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-zfcpdump4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8perf4.18.0-553.171.1.el8_10ALSA-2026:75747
AlmaLinux:8python3-perf4.18.0-553.171.1.el8_10ALSA-2026:75747
Debian:12linuxno fix listedDEBIAN-CVE-2026-53230
Debian:13linux6.12.94-1DEBIAN-CVE-2026-53230
Debian:14linux7.0.13-1DEBIAN-CVE-2026-53230
Rocky Linux:8kernel0:4.18.0-553.171.1.el8_10RLSA-2026:75747
Rocky Linux:8kernel-rt0:4.18.0-553.171.1.rt7.512.el8_10RLSA-2026:75746
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux6.8.0-146.146UBUNTU-CVE-2026-53230
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux7.0.0-31.31UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-aws6.8.0-1066.69UBUNTU-CVE-2026-53230
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-aws7.0.0-1012.12UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1066.69~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-aws-7.07.0.0-1012.12~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure6.8.0-1070.78UBUNTU-CVE-2026-53230
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-azure7.0.0-1014.14UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1070.78~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1068.75UBUNTU-CVE-2026-53230
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1013.13UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1068.75~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-gcp6.8.0-1070.78UBUNTU-CVE-2026-53230
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-gcp7.0.0-1011.11UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1070.78~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-gke6.8.0-1065.73UBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-gke7.0.0-1006.7UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1051.55UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-31.31~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-ibm6.8.0-1066.67UBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-ibm7.0.0-1013.13UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1066.67~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-146.146.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-146.146.1~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1064.67UBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1018.18UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1064.67~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1018.18~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2018.18UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1064.67.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1035.38UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1013.13UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oracle6.8.0-1063.66UBUNTU-CVE-2026-53230
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-oracle7.0.0-1011.11UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-53230
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-raspi7.0.0-1019.19UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-realtime7.0.0-31.31.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-53230
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-53230
Ubuntu:26.04:LTSlinux-riscv7.0.0-31.31.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-146.146~22.04.1UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-31.31.1~24.04.1UBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-vmware6.8.0-1008.8UBUNTU-CVE-2026-53230
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-53230
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-53230

Affected products (as reported)

VendorProductVersions
Linux Linux e16aea2744abea612c27ee0eef606c6a6a8204de – before 87149f3e53f3839454b837f87a2ec7c926775a6ae16aea2744abea612c27ee0eef606c6a6a8204de – before 41781f2789309462520a93822e946521ed78f97fe16aea2744abea612c27ee0eef606c6a6a8204de – before 537d87784e81c3d7037525b99416455cee088cdce16aea2744abea612c27ee0eef606c6a6a8204de – before 0f807764bb122fd63aa45f4229cb1ef2679fbd40e16aea2744abea612c27ee0eef606c6a6a8204de – before 2398e497389ed4be43f7cfbab499b49cec7dae1ae16aea2744abea612c27ee0eef606c6a6a8204de – before 894e036a24a26a6dd7b17d8d3fb5c53ab48a6074
Linux Linux 4.5

Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:H

References