CVE-2026-74285

Estado: RecibidaAlta (8.8)—

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

net: Stop leased rxq before uninstalling its memory provider

netif_rxq_cleanup_unlease() tears down the memory provider that was installed on a physical RX queue through a netkit queue lease. It currently revokes the provider's DMA mappings before stopping the physical queue:

This inverts the ordering used by the regular teardown paths (normal device unregister and the io_uring zcrx close path), which stop the queue before revoking the provider's mappings.

With the physical queue still live, its NAPI can keep consuming net_iov entries from the page_pool alloc cache after the __netif_mp_uninstall_rxq() has already cleared their dma_addr, opening a window for the device to DMA to a stale or zero address.

Leer descripción completaMostrar menos

Fix it by swapping the two calls so the queue is stopped (and its NAPI quiesced) before the provider is uninstalled. No functional regression was observed across repeated runs of the nk_qlease.py HW selftest, which exercises the lease teardown path; this was tested against fbnic QEMU emulation.

Detalles técnicos trazas, registros y código del informe original

  __netif_mp_uninstall_rxq(virt_rxq, p);            /* DMA unmap */
  __netif_mp_close_rxq(phys_rxq->dev, rxq_idx, p);  /* queue stop */

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.17%
Percentil entre todas las CVEs puntuadas: 5
Fecha de la puntuación: 6/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact70 %

AV:L/PR:L sin UI permite escalada de privilegios local. DMA a direcciones obsoletas causa DoS y corrupción de memoria; el kernel afectado es Linux.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Restrict File and Directory Permissions Remote Data Storage Filter Network Traffic Execution Prevention Encrypt Sensitive Information

Tecnologías afectadas (1)

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

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-74285",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 2
      }
    ]
  },
  "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": "5602ad61ebee99c83081fba1aaf5814736edc3e7",
              "lessThan": "03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5602ad61ebee99c83081fba1aaf5814736edc3e7",
              "lessThan": "37314c9dbe95b4d924c7b61aaf563cec4f4e4133",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/core/netdev_rx_queue.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/core/netdev_rx_queue.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:28.037",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/37314c9dbe95b4d924c7b61aaf563cec4f4e4133",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Stop leased rxq before uninstalling its memory provider\n\nnetif_rxq_cleanup_unlease() tears down the memory provider that was\ninstalled on a physical RX queue through a netkit queue lease. It\ncurrently revokes the provider's DMA mappings before stopping the\nphysical queue:\n\n  __netif_mp_uninstall_rxq(virt_rxq, p);            /* DMA unmap */\n  __netif_mp_close_rxq(phys_rxq->dev, rxq_idx, p);  /* queue stop */\n\nThis inverts the ordering used by the regular teardown paths (normal\ndevice unregister and the io_uring zcrx close path), which stop the\nqueue before revoking the provider's mappings.\n\nWith the physical queue still live, its NAPI can keep consuming\nnet_iov entries from the page_pool alloc cache after the\n__netif_mp_uninstall_rxq() has already cleared their dma_addr,\nopening a window for the device to DMA to a stale or zero address.\n\nFix it by swapping the two calls so the queue is stopped (and its\nNAPI quiesced) before the provider is uninstalled. No functional\nregression was observed across repeated runs of the nk_qlease.py\nHW selftest, which exercises the lease teardown path; this was\ntested against fbnic QEMU emulation."
    }
  ],
  "lastModified": "2026-08-17T06:19:22.390",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}