CVE-2026-45973 (GCVE-0-2026-45973)
Vulnerability from cvelistv5
Published
2026-05-27 12:18
Modified
2026-05-27 12:18
Severity ?
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 6b0acf6a94c31efa43fce4edc22413a3390f9c05
Version: ede132a5cf559f3ab35a4c28bac4f4a6c20334d8
Version: ede132a5cf559f3ab35a4c28bac4f4a6c20334d8
Version: ede132a5cf559f3ab35a4c28bac4f4a6c20334d8
Version: 921fcf2971a1e8d3b904ba2c2905b96f4ec3d4ad
Version: 542bd62b7a7f37182c9ef192c2bd25d118c144e4
Version: 6.12.2   ≤
Version: 6.6.64   ≤
Version: 6.11.11   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/main.c",
            "drivers/infiniband/hw/mlx5/mlx5_ib.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/main.c",
            "drivers/infiniband/hw/mlx5/mlx5_ib.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.13"
            },
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              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
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            {
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              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "6.12.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix UMR hang in LAG error state unload\n\nDuring firmware reset in LAG mode, a race condition causes the driver\nto hang indefinitely while waiting for UMR completion during device\nunload. See [1].\n\nIn LAG mode the bond device is only registered on the master, so it\nnever sees sys_error events from the slave.\nDuring firmware reset this causes UMR waits to hang forever on unload\nas the slave is dead but the master hasn\u0027t entered error state yet, so\nUMR posts succeed but completions never arrive.\n\nFix this by adding a sys_error notifier that gets registered before\nMLX5_IB_STAGE_IB_REG and stays alive until after ib_unregister_device().\nThis ensures error events reach the bond device throughout teardown.\n\n[1]\nCall Trace:\n __schedule+0x2bd/0x760\n schedule+0x37/0xa0\n schedule_preempt_disabled+0xa/0x10\n __mutex_lock.isra.6+0x2b5/0x4a0\n __mlx5_ib_dereg_mr+0x606/0x870 [mlx5_ib]\n ? __xa_erase+0x4a/0xa0\n ? _cond_resched+0x15/0x30\n ? wait_for_completion+0x31/0x100\n ib_dereg_mr_user+0x48/0xc0 [ib_core]\n ? rdmacg_uncharge_hierarchy+0xa0/0x100\n destroy_hw_idr_uobject+0x20/0x50 [ib_uverbs]\n uverbs_destroy_uobject+0x37/0x150 [ib_uverbs]\n __uverbs_cleanup_ufile+0xda/0x140 [ib_uverbs]\n uverbs_destroy_ufile_hw+0x3a/0xf0 [ib_uverbs]\n ib_uverbs_remove_one+0xc3/0x140 [ib_uverbs]\n remove_client_context+0x8b/0xd0 [ib_core]\n disable_device+0x8c/0x130 [ib_core]\n __ib_unregister_device+0x10d/0x180 [ib_core]\n ib_unregister_device+0x21/0x30 [ib_core]\n __mlx5_ib_remove+0x1e4/0x1f0 [mlx5_ib]\n auxiliary_bus_remove+0x1e/0x30\n device_release_driver_internal+0x103/0x1f0\n bus_remove_device+0xf7/0x170\n device_del+0x181/0x410\n mlx5_rescan_drivers_locked.part.10+0xa9/0x1d0 [mlx5_core]\n mlx5_disable_lag+0x253/0x260 [mlx5_core]\n mlx5_lag_disable_change+0x89/0xc0 [mlx5_core]\n mlx5_eswitch_disable+0x67/0xa0 [mlx5_core]\n mlx5_unload+0x15/0xd0 [mlx5_core]\n mlx5_unload_one+0x71/0xc0 [mlx5_core]\n mlx5_sync_reset_reload_work+0x83/0x100 [mlx5_core]\n process_one_work+0x1a7/0x360\n worker_thread+0x30/0x390\n ? create_worker+0x1a0/0x1a0\n kthread+0x116/0x130\n ? kthread_flush_work_fn+0x10/0x10\n ret_from_fork+0x22/0x40"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:18:32.270Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c8fb5c965ac7d0104872a8e4f6451f3bc6328199"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d838873da9cb97551d42316967cc82bf8f8031b"
        },
        {
          "url": "https://git.kernel.org/stable/c/613f5d4139b6ba801ccd93f9a28943be60d903bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/ebc2164a4cd4314503f1a0c8e7aaf76d7e5fa211"
        }
      ],
      "title": "RDMA/mlx5: Fix UMR hang in LAG error state unload",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45973",
    "datePublished": "2026-05-27T12:18:32.270Z",
    "dateReserved": "2026-05-13T15:03:33.090Z",
    "dateUpdated": "2026-05-27T12:18:32.270Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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