CVE-2026-98347 (GCVE-0-2026-98347)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: IB/IPoIB: Avoid restoring OPER_UP after multicast flush ipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to prevent multicast joins while ipoib_mcast_dev_flush() is running, and restores the flag afterwards if it was previously set. This restore races with ipoib_ib_dev_down(). If the interface is brought down while the flush is in progress, ipoib_ib_dev_down() clears IPOIB_FLAG_OPER_UP, but the flush path may set it again after the device has already gone down. Since commit 894021a75291 ("IB/ipoib: Make the carrier_on_task race aware"), ipoib_mcast_carrier_on_task() relies on IPOIB_FLAG_OPER_UP being cleared to terminate its rtnl_trylock() retry loop. If the flag is left set after shutdown, the workqueue retries forever, causing teardown to deadlock when ipoib_ndo_uninit() waits in destroy_workqueue() while holding RTNL. Instead of overloading IPOIB_FLAG_OPER_UP to block multicast joins during a light flush, introduce a dedicated IPOIB_FLAG_MCAST_FLUSH flag. Use it together with IPOIB_FLAG_OPER_UP to determine whether multicast joins are allowed, avoiding the race with device shutdown.
References
Impacted products
Vendor Product Version
Linux Linux Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: 344bacca8cd811809fc33a249f2738ab757d327f
Version: a289c65ca49d2680a3d797e633e57a45573d1df2
Version: b81459c78935e4579a577b2366c5f8878d3c7fee
Version: 8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5
Version: dfe809702a11bd7fb91c882fb55620e39ce22109
Version: 87160fb51bc343793cc8f5f031a87f1a35aecb82
Version: 749fd55dd210f9676f0d445a6efaaa3bec65174a
Version: 3.2.84   ≤
Version: 3.10.105   ≤
Version: 3.12.65   ≤
Version: 3.16.39   ≤
Version: 4.4.24   ≤
Version: 4.7.7   ≤
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/ulp/ipoib/ipoib.h",
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            "drivers/infiniband/ulp/ipoib/ipoib_multicast.c"
          ],
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            },
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        },
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/ulp/ipoib/ipoib.h",
            "drivers/infiniband/ulp/ipoib/ipoib_ib.c",
            "drivers/infiniband/ulp/ipoib/ipoib_multicast.c"
          ],
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
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            {
              "lessThanOrEqual": "*",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/IPoIB: Avoid restoring OPER_UP after multicast flush\n\nipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to\nprevent multicast joins while ipoib_mcast_dev_flush() is running, and\nrestores the flag afterwards if it was previously set.\n\nThis restore races with ipoib_ib_dev_down(). If the interface is brought\ndown while the flush is in progress, ipoib_ib_dev_down() clears\nIPOIB_FLAG_OPER_UP, but the flush path may set it again after the device\nhas already gone down.\n\nSince commit 894021a75291 (\"IB/ipoib: Make the carrier_on_task race\naware\"), ipoib_mcast_carrier_on_task() relies on IPOIB_FLAG_OPER_UP\nbeing cleared to terminate its rtnl_trylock() retry loop. If the flag is\nleft set after shutdown, the workqueue retries forever, causing teardown\nto deadlock when ipoib_ndo_uninit() waits in destroy_workqueue() while\nholding RTNL.\n\nInstead of overloading IPOIB_FLAG_OPER_UP to block multicast joins\nduring a light flush, introduce a dedicated IPOIB_FLAG_MCAST_FLUSH flag.\nUse it together with IPOIB_FLAG_OPER_UP to determine whether multicast\njoins are allowed, avoiding the race with device shutdown."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:17:58.195Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938"
        },
        {
          "url": "https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9"
        },
        {
          "url": "https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89"
        },
        {
          "url": "https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f"
        }
      ],
      "title": "IB/IPoIB: Avoid restoring OPER_UP after multicast flush",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98347",
    "datePublished": "2026-10-06T08:46:36.136Z",
    "dateReserved": "2026-09-25T10:25:14.343Z",
    "dateUpdated": "2026-10-19T09:17:58.195Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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