CVE-2022-50885

Estado: AplazadaAlta (7.5)—

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

RDMA/rxe: Fix NULL-ptr-deref in rxe_qp_do_cleanup() when socket create failed

There is a null-ptr-deref when mount.cifs over rdma:

The root cause of the issue is the socket create failed in rxe_qp_init_req().

So move the reset rxe_qp_do_cleanup() after the NULL ptr check.

Detalles técnicos trazas, registros y código del informe original

  BUG: KASAN: null-ptr-deref in rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe]
  Read of size 8 at addr 0000000000000018 by task mount.cifs/3046

  CPU: 2 PID: 3046 Comm: mount.cifs Not tainted 6.1.0-rc5+ #62
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc3
  Call Trace:
   <TASK>
   dump_stack_lvl+0x34/0x44
   kasan_report+0xad/0x130
   rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe]
   execute_in_process_context+0x25/0x90
   __rxe_cleanup+0x101/0x1d0 [rdma_rxe]
   rxe_create_qp+0x16a/0x180 [rdma_rxe]
   create_qp.part.0+0x27d/0x340
   ib_create_qp_kernel+0x73/0x160
   rdma_create_qp+0x100/0x230
   _smbd_get_connection+0x752/0x20f0
   smbd_get_connection+0x21/0x40
   cifs_get_tcp_session+0x8ef/0xda0
   mount_get_conns+0x60/0x750
   cifs_mount+0x103/0xd00
   cifs_smb3_do_mount+0x1dd/0xcb0
   smb3_get_tree+0x1d5/0x300
   vfs_get_tree+0x41/0xf0
   path_mount+0x9b3/0xdd0
   __x64_sys_mount+0x190/0x1d0
   do_syscall_64+0x35/0x80
   entry_SYSCALL_64_after_hwframe+0x46/0xb0

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.60%
Percentil entre todas las CVEs puntuadas: 47
Fecha de la puntuación: 5/10/2026

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 access45 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %

Vulnerabilidad de DoS en kernel Linux (AV:N, A:H) explotable remotamente sin autenticación. La pista sugiere T1190 pero es acotada (RDMA/mount.cifs); impacto principal es denegación de servicio por crash de kernel.

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)

Mostrar

{
  "id": "CVE-2022-50885",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
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      "affectedData": [
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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        },
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            },
            {
              "status": "unaffected",
              "version": "5.4.229",
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            },
            {
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "5.15.86",
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            },
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            },
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              "version": "6.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/infiniband/sw/rxe/rxe_qp.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-30T13:16:03.603",
  "references": [
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      "url": "https://git.kernel.org/stable/c/5b924632d84a60bc0c7fe6e9bbbce99d03908957",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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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/f67376d801499f4fa0838c18c1efcad8840e550d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix NULL-ptr-deref in rxe_qp_do_cleanup() when socket create failed\n\nThere is a null-ptr-deref when mount.cifs over rdma:\n\n  BUG: KASAN: null-ptr-deref in rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe]\n  Read of size 8 at addr 0000000000000018 by task mount.cifs/3046\n\n  CPU: 2 PID: 3046 Comm: mount.cifs Not tainted 6.1.0-rc5+ #62\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc3\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x34/0x44\n   kasan_report+0xad/0x130\n   rxe_qp_do_cleanup+0x2f3/0x360 [rdma_rxe]\n   execute_in_process_context+0x25/0x90\n   __rxe_cleanup+0x101/0x1d0 [rdma_rxe]\n   rxe_create_qp+0x16a/0x180 [rdma_rxe]\n   create_qp.part.0+0x27d/0x340\n   ib_create_qp_kernel+0x73/0x160\n   rdma_create_qp+0x100/0x230\n   _smbd_get_connection+0x752/0x20f0\n   smbd_get_connection+0x21/0x40\n   cifs_get_tcp_session+0x8ef/0xda0\n   mount_get_conns+0x60/0x750\n   cifs_mount+0x103/0xd00\n   cifs_smb3_do_mount+0x1dd/0xcb0\n   smb3_get_tree+0x1d5/0x300\n   vfs_get_tree+0x41/0xf0\n   path_mount+0x9b3/0xdd0\n   __x64_sys_mount+0x190/0x1d0\n   do_syscall_64+0x35/0x80\n   entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThe root cause of the issue is the socket create failed in\nrxe_qp_init_req().\n\nSo move the reset rxe_qp_do_cleanup() after the NULL ptr check."
    }
  ],
  "lastModified": "2026-08-04T10:18:25.417",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}