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CVE-2026-98277

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

eth: fbnic: ring the doorbell if a burst ends in a drop

fbnic_tx_map() skips the doorbell write, and the completion request, for every packet handed to it with xmit_more set, counting on the packet which ends the burst to publish them all. When that packet is dropped instead - skb_put_padto(), skb_cow_head() or a DMA mapping failure - nothing rings. The descriptors of the preceding packets stay invisible to the HW until the next transmit on that queue, which for a burst-then-idle workload may never come.

Remember the meta descriptor of the last packet left without a doorbell and flush it from the error paths.

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The completion request has to be set on that descriptor rather than simply writing the tail, otherwise the HW would transmit the packets but never report a head, and the ring would fill up and stall for good.

This is very similar to Joe's recent series of fixes for bnxt. Not seen in real life, reproduced under QEMU with failure injection.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-98277",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "9a57bacd574b52b08bc2c600af6a8c7a87049ecf",
              "lessThan": "60ef74357a36ed2a102a75bb68d37aa7f305b94e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9a57bacd574b52b08bc2c600af6a8c7a87049ecf",
              "lessThan": "28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9a57bacd574b52b08bc2c600af6a8c7a87049ecf",
              "lessThan": "490599ab23134962a6d18a024e84541d77bdb999",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/meta/fbnic/fbnic_txrx.c",
            "drivers/net/ethernet/meta/fbnic/fbnic_txrx.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/meta/fbnic/fbnic_txrx.c",
            "drivers/net/ethernet/meta/fbnic/fbnic_txrx.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-06T09:18:17.530",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/490599ab23134962a6d18a024e84541d77bdb999",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/60ef74357a36ed2a102a75bb68d37aa7f305b94e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: ring the doorbell if a burst ends in a drop\n\nfbnic_tx_map() skips the doorbell write, and the completion request,\nfor every packet handed to it with xmit_more set, counting on the\npacket which ends the burst to publish them all. When that packet is\ndropped instead - skb_put_padto(), skb_cow_head() or a DMA mapping\nfailure - nothing rings. The descriptors of the preceding packets stay\ninvisible to the HW until the next transmit on that queue, which for a\nburst-then-idle workload may never come.\n\nRemember the meta descriptor of the last packet left without a doorbell\nand flush it from the error paths. The completion request has to be set\non that descriptor rather than simply writing the tail, otherwise the HW\nwould transmit the packets but never report a head, and the ring would\nfill up and stall for good.\n\nThis is very similar to Joe's recent series of fixes for bnxt.\nNot seen in real life, reproduced under QEMU with failure injection."
    }
  ],
  "lastModified": "2026-10-06T09:18:17.530",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}