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CVE-2023-53794

Estado: AplazadaCrítica (9.8)—

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

cifs: fix session state check in reconnect to avoid use-after-free issue

Don't collect exiting session in smb2_reconnect_server(), because it will be released soon.

Note that the exiting session will stay in server->smb_ses_list until it complete the cifs_free_ipc() and logoff() and then delete itself from the list.

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.

Vector CVSS AV:N/AC:L/PR:N/UI:N sugiere explotación remota sin privilegios (T1190). Use-after-free en kernel Linux puede permitir escalada de privilegios (T1068) o DoS (T1499.004).

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 TrafficApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability ScanningThreat Intelligence Program

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)

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{
  "id": "CVE-2023-53794",
  "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": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93",
              "lessThan": "7e4f5c3f01fb0e51ca438e43262d858daf9a0a76",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93",
              "lessThan": "759ffc164d95a32c09528766d74d9b4fb054e8f4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4fcd1813e6404dd4420c7d12fb483f9320f0bf93",
              "lessThan": "99f280700b4cc02d5f141b8d15f8e9fad0418f65",
              "versionType": "git"
            },
            {
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            {
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            {
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              "version": "59b520454b323ec43b2ae757217332cea33091e0",
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            {
              "status": "affected",
              "version": "e20c888e2b3576e5f498c167729d274ef60b86f8",
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            },
            {
              "status": "affected",
              "version": "4ce7aa4e44d88ce64ea8ae2337b8910f3670b0ba",
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            },
            {
              "status": "affected",
              "version": "419fad68e4c4135ff9859e9214dd6cf954413ca1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3.10.103",
              "lessThan": "3.11",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.12.63",
              "lessThan": "3.13",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.14.74",
              "lessThan": "3.15",
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            },
            {
              "status": "affected",
              "version": "3.16.37",
              "lessThan": "3.17",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "3.18.37",
              "lessThan": "3.19",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.1.28",
              "lessThan": "4.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.4.16",
              "lessThan": "4.5",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.6.5",
              "lessThan": "4.7",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/smb/client/smb2pdu.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.7",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.47",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.4.12",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/client/smb2pdu.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-09T01:16:50.957",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/759ffc164d95a32c09528766d74d9b4fb054e8f4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e4f5c3f01fb0e51ca438e43262d858daf9a0a76",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/99f280700b4cc02d5f141b8d15f8e9fad0418f65",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix session state check in reconnect to avoid use-after-free issue\n\nDon't collect exiting session in smb2_reconnect_server(), because it\nwill be released soon.\n\nNote that the exiting session will stay in server->smb_ses_list until\nit complete the cifs_free_ipc() and logoff() and then delete itself\nfrom the list."
    }
  ],
  "lastModified": "2026-08-04T10:19:21.410",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}