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CVE-2025-68263

Estado: AplazadaCrítica (9.8)—

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

ksmbd: ipc: fix use-after-free in ipc_msg_send_request

ipc_msg_send_request() waits for a generic netlink reply using an ipc_msg_table_entry on the stack. The generic netlink handler (handle_generic_event()/handle_response()) fills entry->response under ipc_msg_table_lock, but ipc_msg_send_request() used to validate and free entry->response without holding the same lock.

Under high concurrency this allows a race where handle_response() is copying data into entry->response while ipc_msg_send_request() has just freed it, leading to a slab-use-after-free reported by KASAN in handle_generic_event():

Leer descripción completaMostrar menos

This makes all accesses to entry->response consistent with handle_response(), which already updates and fills the response buffer under ipc_msg_table_lock, and closes the race that allowed the UAF.

Detalles técnicos trazas, registros y código del informe original
  BUG: KASAN: slab-use-after-free in handle_generic_event+0x3c4/0x5f0 [ksmbd]
  Write of size 12 at addr ffff888198ee6e20 by task pool/109349
  ...
  Freed by task:
    kvfree
    ipc_msg_send_request [ksmbd]
    ksmbd_rpc_open -> ksmbd_session_rpc_open [ksmbd]

Fix by:
- Taking ipc_msg_table_lock in ipc_msg_send_request() while validating
  entry->response, freeing it when invalid, and removing the entry from
  ipc_msg_table.
- Returning the final entry->response pointer to the caller only after
  the hash entry is removed under the lock.
- Returning NULL in the error path, preserving the original API
  semantics.

CVSS

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).

🎯 Técnicas ATT&CK

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

Vuln. de red remota sin autenticación (AV:N/PR:N) en ksmbd (SMB kernel). Use-after-free puede causar DoS (crash) o escalada de privilegios local.

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 TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication 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 KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-68263",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "de85fb58f9967ba024bb08e0041613d37b57b4d1",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "708a620b471a14466f1f52c90bf3f65ebdb31460",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "versionType": "git"
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            {
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "lessThan": "1fab1fa091f5aa97265648b53ea031deedd26235",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/server/transport_ipc.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": "6.1.160",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.62",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.12",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.1",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/server/transport_ipc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-16T15:15:55.813",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1fab1fa091f5aa97265648b53ea031deedd26235",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/708a620b471a14466f1f52c90bf3f65ebdb31460",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/759c8c30cfa8706c518e56f67971b1f0932f4b9b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8229c6ca50cea701e25a7ee25f48441b582ec5fa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/de85fb58f9967ba024bb08e0041613d37b57b4d1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: ipc: fix use-after-free in ipc_msg_send_request\n\nipc_msg_send_request() waits for a generic netlink reply using an\nipc_msg_table_entry on the stack. The generic netlink handler\n(handle_generic_event()/handle_response()) fills entry->response under\nipc_msg_table_lock, but ipc_msg_send_request() used to validate and free\nentry->response without holding the same lock.\n\nUnder high concurrency this allows a race where handle_response() is\ncopying data into entry->response while ipc_msg_send_request() has just\nfreed it, leading to a slab-use-after-free reported by KASAN in\nhandle_generic_event():\n\n  BUG: KASAN: slab-use-after-free in handle_generic_event+0x3c4/0x5f0 [ksmbd]\n  Write of size 12 at addr ffff888198ee6e20 by task pool/109349\n  ...\n  Freed by task:\n    kvfree\n    ipc_msg_send_request [ksmbd]\n    ksmbd_rpc_open -> ksmbd_session_rpc_open [ksmbd]\n\nFix by:\n- Taking ipc_msg_table_lock in ipc_msg_send_request() while validating\n  entry->response, freeing it when invalid, and removing the entry from\n  ipc_msg_table.\n- Returning the final entry->response pointer to the caller only after\n  the hash entry is removed under the lock.\n- Returning NULL in the error path, preserving the original API\n  semantics.\n\nThis makes all accesses to entry->response consistent with\nhandle_response(), which already updates and fills the response buffer\nunder ipc_msg_table_lock, and closes the race that allowed the UAF."
    }
  ],
  "lastModified": "2026-06-17T09:58:49.823",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}