CVE-2026-98615 (GCVE-0-2026-98615)
Vulnerability from cvelistv5
Published
2026-10-18 15:19
Modified
2026-10-19 09:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: Set AW_FLUSH_MODE alongside AW_FLUSH when flushing the mailbox When tearing down the FW mailbox Rx ring, fbnic_mbx_reset_desc_ring() writes AW_CFG with FLUSH set and everything else, BME included, cleared. Clearing BME halts the device's writes to the host but leaves the staged requests parked in the PUL write pipeline rather than draining them, so on the write path FLUSH alone never terminates the outstanding requests and the flush the firmware waits on never completes. Add the FLUSH_MODE definition and set both bits so the staged writes drain out of the pipeline on their own. BME stays cleared, so nothing lands on the host; it is restored later in fbnic_mbx_init_desc_ring() when the ring is rebuilt, once the outstanding writes are gone. The read path is unaffected. AR_CFG has no equivalent mode bit and AR_FLUSH terminates the outstanding reads by itself, so it is left as is. Both writes remain plain stores rather than read-modify-writes. That is deliberate: the matching write in fbnic_mbx_init_desc_ring() restores BME and the TLP attributes, and clears both flush bits as a side effect.
References
Impacted products
Vendor Product Version
Linux Linux Version: fea860a2a6136658708fb530a82d59d29f708b74
Version: 3b12f00ddd08e888273b2ac0488d396d90a836fc
Version: 3b12f00ddd08e888273b2ac0488d396d90a836fc
Version: 3b12f00ddd08e888273b2ac0488d396d90a836fc
Version: 0a4aa8a32ddb96f320173a2e9b0e41f4a6d3746c
Version: 6.12.29   ≤
Version: 6.14.7   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/meta/fbnic/fbnic_csr.h",
            "drivers/net/ethernet/meta/fbnic/fbnic_fw.c"
          ],
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          ]
        },
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/meta/fbnic/fbnic_csr.h",
            "drivers/net/ethernet/meta/fbnic/fbnic_fw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.15"
            },
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              "status": "unaffected",
              "version": "0",
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            {
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              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.55",
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                },
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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\neth: fbnic: Set AW_FLUSH_MODE alongside AW_FLUSH when flushing the mailbox\n\nWhen tearing down the FW mailbox Rx ring, fbnic_mbx_reset_desc_ring()\nwrites AW_CFG with FLUSH set and everything else, BME included, cleared.\nClearing BME halts the device\u0027s writes to the host but leaves the staged\nrequests parked in the PUL write pipeline rather than draining them, so\non the write path FLUSH alone never terminates the outstanding requests\nand the flush the firmware waits on never completes.\n\nAdd the FLUSH_MODE definition and set both bits so the staged writes\ndrain out of the pipeline on their own. BME stays cleared, so nothing\nlands on the host; it is restored later in fbnic_mbx_init_desc_ring()\nwhen the ring is rebuilt, once the outstanding writes are gone.\n\nThe read path is unaffected. AR_CFG has no equivalent mode bit and\nAR_FLUSH terminates the outstanding reads by itself, so it is left as\nis.\n\nBoth writes remain plain stores rather than read-modify-writes. That is\ndeliberate: the matching write in fbnic_mbx_init_desc_ring() restores\nBME and the TLP attributes, and clears both flush bits as a side effect."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:22:43.182Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ed4163f6ba9b52bfd6216d5215ee7b8eb5072411"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a052cd4b2caee1f90cf0e3874377066939c90e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/a969db6548a1b046cd1423701f5f9c3f5794e90d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8947f13e436a4ff5eed9f8f019b2865a07af4bb2"
        }
      ],
      "title": "eth: fbnic: Set AW_FLUSH_MODE alongside AW_FLUSH when flushing the mailbox",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98615",
    "datePublished": "2026-10-18T15:19:35.307Z",
    "dateReserved": "2026-09-25T10:25:14.360Z",
    "dateUpdated": "2026-10-19T09:22:43.182Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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