CVE-2026-89973

Estado: RecibidaAlta (8.2)—

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

nvme-tcp: check the data direction of a C2HData PDU

nvme_tcp_handle_c2h_data() finds the request by command id and checks that it has a payload, but it does not check that the command asked for data to be read. A controller that answers a write command with C2HData therefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits WARN_ON_ONCE(i->data_source) and returns 0. The receive path turns that into -EFAULT and resets the controller.

No data is copied, so this is not memory corruption. What a controller gets is a kernel warning it can raise at will, which is fatal on a host booted with panic_on_warn.

Leer descripción completaMostrar menos

The send path already knows the direction - it consults rq_data_dir() when it builds a command - and nvme_tcp_handle_r2t() checks the length and the offset of the request it names. The C2HData path does not check the direction at all.

Reject a C2HData PDU whose command is not a read. Rejecting it fails the command and resets the controller, as the neighbouring check in this function does; what goes away is the warning.

Detalles técnicos trazas, registros y código del informe original

  [    6.885580] ------------[ cut here ]------------
  [    6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71
  [    6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)
  [    6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work
  [    6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330
  [    6.903739] Call Trace:
  [    6.904085]  <TASK>
  [    6.909254]  __skb_datagram_iter+0x433/0x820
  [    6.911026]  skb_copy_datagram_iter+0x37/0x120
  [    6.911622]  nvme_tcp_recv_skb+0xa07/0x4320
  [    6.913378]  __tcp_read_sock+0x1ab/0x810
  [    6.915788]  nvme_tcp_try_recv+0x152/0x1e0
  [    6.918222]  nvme_tcp_io_work+0x1e4/0x6c0
  [    6.926906]  </TASK>
  [    6.927226] ---[ end trace 0000000000000000 ]---
  [    6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data
  [    6.928709] nvme nvme0: receive failed:  -14

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Puntuación base: 8.2

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.63%
Percentil entre todas las CVEs puntuadas: 49
Fecha de la puntuación: 4/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %
Impacto principalT1499.004 Application or System Exploitationimpact80 %

Vulnerabilidad en nvme-tcp que permite a un controlador remoto enviar PDUs C2HData malformadas (AV:N, sin autenticación) causando kernel warnings fatales en hosts con panic_on_warn, resultando en DoS de aplicación.

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

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

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-2026-89973",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.2,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 3.9
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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              "status": "affected",
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            {
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              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
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              "status": "unaffected",
              "version": "5.15.221",
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            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
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            {
              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.2.5",
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            },
            {
              "status": "unaffected",
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          ],
          "programFiles": [
            "drivers/nvme/host/tcp.c"
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        }
      ]
    }
  ],
  "published": "2026-09-16T11:17:08.057",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "url": "https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: check the data direction of a C2HData PDU\n\nnvme_tcp_handle_c2h_data() finds the request by command id and checks\nthat it has a payload, but it does not check that the command asked for\ndata to be read.  A controller that answers a write command with C2HData\ntherefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits\nWARN_ON_ONCE(i->data_source) and returns 0.  The receive path turns that\ninto -EFAULT and resets the controller.\n\nNo data is copied, so this is not memory corruption.  What a controller\ngets is a kernel warning it can raise at will, which is fatal on a host\nbooted with panic_on_warn.\n\nThe send path already knows the direction - it consults rq_data_dir()\nwhen it builds a command - and nvme_tcp_handle_r2t() checks the length\nand the offset of the request it names.  The C2HData path does not check\nthe direction at all.\n\nReject a C2HData PDU whose command is not a read.  Rejecting it fails\nthe command and resets the controller, as the neighbouring check in this\nfunction does; what goes away is the warning.\n\n  [    6.885580] ------------[ cut here ]------------\n  [    6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71\n  [    6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\n  [    6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work\n  [    6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330\n  [    6.903739] Call Trace:\n  [    6.904085]  <TASK>\n  [    6.909254]  __skb_datagram_iter+0x433/0x820\n  [    6.911026]  skb_copy_datagram_iter+0x37/0x120\n  [    6.911622]  nvme_tcp_recv_skb+0xa07/0x4320\n  [    6.913378]  __tcp_read_sock+0x1ab/0x810\n  [    6.915788]  nvme_tcp_try_recv+0x152/0x1e0\n  [    6.918222]  nvme_tcp_io_work+0x1e4/0x6c0\n  [    6.926906]  </TASK>\n  [    6.927226] ---[ end trace 0000000000000000 ]---\n  [    6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data\n  [    6.928709] nvme nvme0: receive failed:  -14"
    }
  ],
  "lastModified": "2026-09-16T15:18:21.747",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}