In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Fix UMR hang in LAG error state unload
During firmware reset in LAG mode, a race condition causes the driver to hang indefinitely while waiting for UMR completion during device unload. See [1].
In LAG mode the bond device is only registered on the master, so it never sees sys_error events from the slave. During firmware reset this causes UMR waits to hang forever on unload as the slave is dead but the master hasn't entered error state yet, so UMR posts succeed but completions never arrive.
Fix this by adding a sys_error notifier that gets registered before MLX5_IB_STAGE_IB_REG and stays alive until after ib_unregister_device(). This ensures error events reach the bond device throughout teardown.
[1] Call Trace: __schedule+0x2bd/0x760 schedule+0x37/0xa0 schedule_preempt_disabled+0xa/0x10 __mutex_lock.isra.6+0x2b5/0x4a0 __mlx5_ib_dereg_mr+0x606/0x870 [mlx5_ib] ? __xa_erase+0x4a/0xa0 ? _cond_resched+0x15/0x30 ? wait_for_completion+0x31/0x100 ib_dereg_mr_user+0x48/0xc0 [ib_core] ? rdmacg_uncharge_hierarchy+0xa0/0x100 destroy_hw_idr_uobject+0x20/0x50 [ib_uverbs] uverbs_destroy_uobject+0x37/0x150 [ib_uverbs] __uverbs_cleanup_ufile+0xda/0x140 [ib_uverbs] uverbs_destroy_ufile_hw+0x3a/0xf0 [ib_uverbs] ib_uverbs_remove_one+0xc3/0x140 [ib_uverbs] remove_client_context+0x8b/0xd0 [ib_core] disable_device+0x8c/0x130 [ib_core] __ib_unregister_device+0x10d/0x180 [ib_core] ib_unregister_device+0x21/0x30 [ib_core] __mlx5_ib_remove+0x1e4/0x1f0 [mlx5_ib] auxiliary_bus_remove+0x1e/0x30 device_release_driver_internal+0x103/0x1f0 bus_remove_device+0xf7/0x170 device_del+0x181/0x410 mlx5_rescan_drivers_locked.part.10+0xa9/0x1d0 [mlx5_core] mlx5_disable_lag+0x253/0x260 [mlx5_core] mlx5_lag_disable_change+0x89/0xc0 [mlx5_core] mlx5_eswitch_disable+0x67/0xa0 [mlx5_core] mlx5_unload+0x15/0xd0 [mlx5_core] mlx5_unload_one+0x71/0xc0 [mlx5_core] mlx5_sync_reset_reload_work+0x83/0x100 [mlx5_core] process_one_work+0x1a7/0x360 worker_thread+0x30/0x390 ? create_worker+0x1a0/0x1a0 kthread+0x116/0x130 ? kthread_flush_work_fn+0x10/0x10 ret_from_fork+0x22/0x40
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | May 27, 2026 |
| Ubuntu | — | Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-kvmUpgrade linux-image-generic-64kUpgrade linux-image-oem-22.04aUpgrade linux-image-gke-64k-6.8Upgrade linux-image-aws-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-6.8.0-1058-nvidia-lowlatencyUpgrade linux-image-nvidiaUpgrade linux-image-oem-22.04dUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-oracle-64k-lts-24.04Upgrade linux-image-6.8.0-1060-aws-64kUpgrade linux-image-ibmUpgrade linux-image-raspiUpgrade linux-image-6.8.0-1062-azure-fdeUpgrade linux-image-lowlatency-6.8Upgrade linux-image-nvidia-6.8Upgrade linux-image-aws-fips-6.8Upgrade linux-image-6.8.0-1058-nvidia-64kUpgrade linux-image-generic-64k-6.8Upgrade linux-image-oem-20.04cUpgrade linux-image-6.8.0-1063-gcpUpgrade linux-image-aws-fipsUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-nvidia-tegraUpgrade linux-image-oem-22.04cUpgrade linux-image-raspi-6.8Upgrade linux-image-oem-20.04bUpgrade linux-image-realtime-6.8.1Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-6.8.1-1055-realtimeUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-xilinx-6.8Upgrade linux-image-lowlatency-64kUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-gcp-fipsUpgrade linux-image-6.8.0-1058-gke-64kUpgrade linux-image-6.8.0-1060-ibmUpgrade linux-image-azure-fdeUpgrade linux-image-fipsUpgrade linux-image-6.8.0-1057-oracleUpgrade linux-image-oem-22.04Upgrade linux-image-6.8.0-134-genericUpgrade linux-image-6.8.0-1062-azure-fipsUpgrade linux-image-6.8.0-1063-gcp-64kUpgrade linux-image-6.8.0-136-generic-64kUpgrade linux-image-aws-64k-6.8Upgrade linux-image-6.8.0-1045-gkeopUpgrade linux-image-gkeopUpgrade linux-image-6.8.0-1057-oracle-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-6.8.0-1058-nvidia-lowlatency-64kUpgrade linux-image-oracleUpgrade linux-image-awsUpgrade linux-image-6.8.0-134-fipsUpgrade linux-image-oem-22.04bUpgrade linux-image-gcp-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-realtimeUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-6.8.0-1029-nvidia-tegraUpgrade linux-image-xilinxUpgrade linux-image-oem-20.04dUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-6.8.0-1058-nvidiaUpgrade linux-image-6.8.0-1063-gcp-fipsUpgrade linux-image-raspi-realtimeUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-intel-iot-realtimeUpgrade linux-image-6.8.0-1060-raspiUpgrade linux-image-generic-lpaeUpgrade linux-image-generic-6.8Upgrade linux-image-aws-64kUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-fips-6.8Upgrade linux-image-6.8.0-2049-raspi-realtimeUpgrade linux-image-6.8.0-1060-awsUpgrade linux-image-oem-20.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-azure-fde-6.8Upgrade linux-image-genericUpgrade linux-image-6.8.0-136-genericUpgrade linux-image-intel-iotgUpgrade linux-image-aws-lts-24.04Upgrade linux-image-6.8.0-1060-aws-fipsUpgrade linux-image-azure-fips-6.8Upgrade linux-image-6.8.0-134-generic-64kUpgrade linux-image-6.8.0-1058-gkeUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-gkeUpgrade linux-image-oracle-64kUpgrade linux-image-gcp-fips-6.8Upgrade linux-image-gcpUpgrade linux-image-6.8.0-134-lowlatency-64kUpgrade linux-image-virtualUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-gke-64kUpgrade linux-image-laptop-23.10Upgrade linux-image-lowlatencyUpgrade linux-image-ibm-classicUpgrade linux-image-oracle-6.8Upgrade linux-image-6.8.0-134-lowlatencyUpgrade linux-image-azure-fipsUpgrade linux-image-ibm-6.8Upgrade linux-image-oracle-64k-6.8Upgrade linux-image-virtual-6.8Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-azure-lts-24.04 | Jul 2, 2026 | Jul 1, 2026 |
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