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CVE-2026-98812

Estado: RecibidaSin puntuar—
Gravedad—Sin puntuar
Probabilidad de explotación0.18 %mayor que el 7 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado

En el kernel de Linux se ha resuelto la siguiente vulnerabilidad:

net/mctp: publicar el mctp_dev solo después de inicializarlo

mctp_add_dev() enlaza el nuevo mctp_dev en dev->mctp_ptr antes de que se asigne mdev->dev, por lo que un lector que obtenga el dispositivo en esa ventana desreferencia un puntero net_device que todavía es NULL:

Se corrige publicando el objeto solo una vez completamente inicializado: __mctp_dev_get() se ejecuta únicamente bajo rcu_read_lock() y entrega este objeto a los lectores en cuanto se asigna mctp_ptr, por lo que nunca deben observar mdev->dev == NULL.

Detalles técnicos trazas, registros y código del informe original
KASAN: null-ptr-deref in range [0x00000000000000b0-0x00000000000000b7]
Call Trace:
 <TASK>
 ? __pfx_mctp_sendmsg (./include/linux/sockptr.h:49)
 ? __pfx_mctp_dst_output (net/mctp/route.c:41)
 ? selinux_socket_sendmsg (security/selinux/hooks.c:5278)
 ____sys_sendmsg (net/socket.c:775 (discriminator 1) net/socket.c:790
 (discriminator 1) net/socket.c:2684 (discriminator 1))
 ? __pfx_____sys_sendmsg (net/socket.c:1131)
 ? __pfx_copy_msghdr_from_user (net/socket.c:2590)
 ? update_cfs_rq_load_avg (kernel/sched/fair.c:5478)
 ___sys_sendmsg (net/socket.c:2738)
 ? __pfx____sys_sendmsg (net/socket.c:2625)
 ? perf_event_task_tick (./include/linux/rcupdate.h:838)
 ? sched_tick (kernel/sched/core.c:5818)
 ? clockevents_program_event (kernel/time/clockevents.c:372)
 ? fdget (./include/linux/rcupdate.h:873 fs/file.c:1100)
 __sys_sendmsg (net/socket.c:2770)
 ? __pfx___sys_sendmsg (net/socket.c:2751)
 do_syscall_64 (arch/x86/entry/syscall_64.c:63)
 entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
 </TASK>

Traducción automática del texto original de NVD (en inglés).

CVSS

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

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días
0.18 %
Percentil entre todas las CVEs puntuadas
7
Fecha de la puntuación
20/10/2026

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).

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

Mostrar las 4 referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-98812",
  "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": "583be982d93479ea3d85091b0fd0b01201ede87d",
              "lessThan": "af6e4f931afc2d670d133aa2bedc8b6e3753c618",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "583be982d93479ea3d85091b0fd0b01201ede87d",
              "lessThan": "63120572edde85bb2b70b0ed4d4817ed52247613",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "583be982d93479ea3d85091b0fd0b01201ede87d",
              "lessThan": "f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "583be982d93479ea3d85091b0fd0b01201ede87d",
              "lessThan": "aadf655e8ea9a8ffa24bb8d69f504572e8d18181",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/mctp/device.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/mctp/device.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:35.313",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/63120572edde85bb2b70b0ed4d4817ed52247613",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aadf655e8ea9a8ffa24bb8d69f504572e8d18181",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/af6e4f931afc2d670d133aa2bedc8b6e3753c618",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mctp: publish the mctp_dev only after it is initialised\n\nmctp_add_dev() links the new mctp_dev into dev->mctp_ptr before mdev->dev\nis assigned, so a reader that picks the device up in that window\ndereferences a net_device pointer that is still NULL:\n\nKASAN: null-ptr-deref in range [0x00000000000000b0-0x00000000000000b7]\nCall Trace:\n <TASK>\n ? __pfx_mctp_sendmsg (./include/linux/sockptr.h:49)\n ? __pfx_mctp_dst_output (net/mctp/route.c:41)\n ? selinux_socket_sendmsg (security/selinux/hooks.c:5278)\n ____sys_sendmsg (net/socket.c:775 (discriminator 1) net/socket.c:790\n (discriminator 1) net/socket.c:2684 (discriminator 1))\n ? __pfx_____sys_sendmsg (net/socket.c:1131)\n ? __pfx_copy_msghdr_from_user (net/socket.c:2590)\n ? update_cfs_rq_load_avg (kernel/sched/fair.c:5478)\n ___sys_sendmsg (net/socket.c:2738)\n ? __pfx____sys_sendmsg (net/socket.c:2625)\n ? perf_event_task_tick (./include/linux/rcupdate.h:838)\n ? sched_tick (kernel/sched/core.c:5818)\n ? clockevents_program_event (kernel/time/clockevents.c:372)\n ? fdget (./include/linux/rcupdate.h:873 fs/file.c:1100)\n __sys_sendmsg (net/socket.c:2770)\n ? __pfx___sys_sendmsg (net/socket.c:2751)\n do_syscall_64 (arch/x86/entry/syscall_64.c:63)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>\n\nFix by publishing only once the object is fully initialised:\n__mctp_dev_get() runs under rcu_read_lock() only and hands\nthis object to readers as soon as mctp_ptr is assigned, so\nthey must never observe mdev->dev == NULL."
    }
  ],
  "lastModified": "2026-10-19T10:19:45.223",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}