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RDMA/mlx5: Fix UMR hang in LAG error state unload

Type: advisorySource: Official CVE List1 source record

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] _

Announced Source revision 1
Original source ↗

CVE-2026-45973

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-45973

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "921fcf2971a1e8d3b904ba2c2905b96f4ec3d4ad",
        "lessThan": "33deba9bf5c34335182342588315f3db7dbc56d3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6b0acf6a94c31efa43fce4edc22413a3390f9c05",
        "lessThan": "c8fb5c965ac7d0104872a8e4f6451f3bc6328199",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ede132a5cf559f3ab35a4c28bac4f4a6c20334d8",
        "lessThan": "6d838873da9cb97551d42316967cc82bf8f8031b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ede132a5cf559f3ab35a4c28bac4f4a6c20334d8",
        "lessThan": "613f5d4139b6ba801ccd93f9a28943be60d903bc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ede132a5cf559f3ab35a4c28bac4f4a6c20334d8",
        "lessThan": "ebc2164a4cd4314503f1a0c8e7aaf76d7e5fa211",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "542bd62b7a7f37182c9ef192c2bd25d118c144e4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.64",
        "lessThan": "6.6.160",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.12.2",
        "lessThan": "6.12.75",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.11.11",
        "lessThan": "6.12",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/mlx5/main.c",
      "drivers/infiniband/hw/mlx5/mlx5_ib.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.75",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/mlx5/main.c",
      "drivers/infiniband/hw/mlx5/mlx5_ib.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-45973

Source reference: /cveMetadata/cveId

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Event
#46318 · Revision 1
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