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.
CVSS Details
- CVSS 3.1 Base Score: 8.7
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-develUpgrade kernel6.12-debuginfoUpgrade kernel6.18-develUpgrade python3-perf6.12Upgrade kernel6.18Upgrade kernel6.18-tools-develUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.18-modules-extra-commonUpgrade perf6.12-debuginfoUpgrade python3-perf6.18Upgrade kernel6.12-tools-develUpgrade bpftool6.18Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-headersUpgrade perf6.18Upgrade kernel6.12-toolsUpgrade microvm-kernel6.18Upgrade kernel6.12Upgrade python3-perf6.18-debuginfoUpgrade kernel6.18-headersUpgrade kernel6.18-modules-extraUpgrade kernel6.18-debuginfoUpgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel-livepatch-6.12.94-123.174Upgrade bpftool6.12Upgrade kernel6.18-toolsUpgrade kernel6.18-debuginfo-common-x86_64Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-modules-extra-commonUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-modules-extraUpgrade bpftool6.18-debuginfoUpgrade kernel-livepatch-6.18.36-69.134Upgrade perf6.18-debuginfoUpgrade perf6.12Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-debuginfo-common-aarch64 | Jul 21, 2026 | Jun 25, 2026 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | Upgrade kernel-rtUpgrade kernelNo solution exists | Jul 17, 2026 | Jun 25, 2026 |
| Rocky_linux | — | Upgrade kernel-modulesUpgrade kernel-debugUpgrade python3-perfUpgrade perfUpgrade perf-debuginfoUpgrade kernel-rt-develUpgrade kernel-rtUpgrade kernel-rt-debug-modules-extraUpgrade kernel-rt-debugUpgrade kernel-tools-debuginfoUpgrade kernel-rt-coreUpgrade kernel-coreUpgrade kernel-toolsUpgrade kernel-develUpgrade kernel-rt-debuginfoUpgrade kernel-debug-coreUpgrade kernel-rt-kvmUpgrade kernel-rt-modulesUpgrade kernel-tools-libs-develUpgrade kernel-tools-libsUpgrade python3-perf-debuginfoUpgrade kernel-debug-modulesUpgrade kernel-rt-debug-modulesUpgrade bpftoolUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-rt-modules-extraUpgrade kernel-debuginfoUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-debug-coreUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-debug-develUpgrade kernel-rt-debug-kvmUpgrade kernel-rt-debug-develUpgrade kernel-modules-extraUpgrade kernel-debug-modules-extraUpgrade bpftool-debuginfoUpgrade kernel-debug-debuginfo | Oct 7, 2026 | Oct 6, 2026 |
| Ubuntu | — | Upgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-oem-26.04bUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-virtualUpgrade linux-image-azure-lts-26.04Upgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-gcpUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-oracleUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-realtimeUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-oracle-64kUpgrade linux-image-generic-64k-7.0Upgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-aws-64kUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-azure-7.0Upgrade linux-image-gkeUpgrade linux-image-oracle-7.0Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-ibmUpgrade linux-image-gcp-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1035-nvidia-tegra-rtUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-raspi-realtimeUpgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-awsUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-6.8.0-1035-nvidia-tegraUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-oem-26.04aUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-gke-64kUpgrade linux-image-generic-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-gke-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-7.0.0-1012-awsUpgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-gcp-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-nvidia-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-nvidia-tegraUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-raspiUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidiaUpgrade linux-image-gke-64k-7.0Upgrade linux-image-azureUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-aws-7.0Upgrade linux-image-genericUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-generic-64k | Sep 14, 2026 | Sep 7, 2026 |
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