FKIE_CVE-2026-98347

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-06 09:18
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/ulp/ipoib/ipoib.h",
            "drivers/infiniband/ulp/ipoib/ipoib_ib.c",
            "drivers/infiniband/ulp/ipoib/ipoib_multicast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f973769fb7cb33ba0d4a64b7dcfee0cabaead938",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "lessThan": "b72f38929f4b5aa83161fd3b22a7327207e51ec5",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "lessThan": "1b11e4b55b41d9e69a8e8d07622614202e2eaca9",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "lessThan": "326f7d34bd7e64de535566b65c0533b640df5a81",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "lessThan": "5ad925d45f28464a5e043c9620880bb6a030da89",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "lessThan": "188b334a6db36a8e0bfaaf59bc4020639a0f3aad",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "lessThan": "1ff3add37c329704ec46181b4ae4f00f9f16ce6f",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "lessThan": "9a141d3dc869d18b2eab35e999f4790a9b84e40f",
              "status": "affected",
              "version": "344bacca8cd811809fc33a249f2738ab757d327f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a289c65ca49d2680a3d797e633e57a45573d1df2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b81459c78935e4579a577b2366c5f8878d3c7fee",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dfe809702a11bd7fb91c882fb55620e39ce22109",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "87160fb51bc343793cc8f5f031a87f1a35aecb82",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "749fd55dd210f9676f0d445a6efaaa3bec65174a",
              "versionType": "git"
            },
            {
              "lessThan": "3.3",
              "status": "affected",
              "version": "3.2.84",
              "versionType": "semver"
            },
            {
              "lessThan": "3.11",
              "status": "affected",
              "version": "3.10.105",
              "versionType": "semver"
            },
            {
              "lessThan": "3.13",
              "status": "affected",
              "version": "3.12.65",
              "versionType": "semver"
            },
            {
              "lessThan": "3.17",
              "status": "affected",
              "version": "3.16.39",
              "versionType": "semver"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.24",
              "versionType": "semver"
            },
            {
              "lessThan": "4.8",
              "status": "affected",
              "version": "4.7.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/ulp/ipoib/ipoib.h",
            "drivers/infiniband/ulp/ipoib/ipoib_ib.c",
            "drivers/infiniband/ulp/ipoib/ipoib_multicast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-98347",
  "lastModified": "2026-10-06T09:18:27.773",
  "metrics": {},
  "published": "2026-10-06T09:18:27.773",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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