CVE-2026-64383

Estado: AnalizadaCrítica (9.8)—

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

smb: client: fix double-free in SMB2_flush() replay

SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time.

Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.46%
Percentil entre todas las CVEs puntuadas: 37
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 access60 %
Impacto principalT1059 Command and Scripting Interpreterexecution55 %

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account Management Vulnerability Scanning Restrict Web-Based Content Network Segmentation Limit Software Installation Limit Access to Resource Over Network

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-415

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-64383",
  "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": "433042a91f9373241307725b52de573933ffedbf",
              "lessThan": "6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "lessThan": "878757163eea684750107a31ea134c103863515d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "lessThan": "3407240cde132a4b72d6429a2625a09a2f78adaf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "lessThan": "013a9a3da46c5dabcf18f65ea6a47874ba12a15d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "lessThan": "4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.6.32",
              "lessThan": "6.6.145",
              "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": "6.8"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.8",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/client/smb2pdu.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-25T10:17:21.587",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/013a9a3da46c5dabcf18f65ea6a47874ba12a15d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adaf",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/878757163eea684750107a31ea134c103863515d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_flush() replay\n\nSMB2_flush() keeps its response buffer bookkeeping across replay\nattempts. If a replayable flush response is received and the retry then\nfails before cifs_send_recv() stores a replacement response, flush_exit\nwill free the stale response pointer a second time.\n\nReinitialize resp_buftype and rsp_iov at the top of the replay loop so\ncleanup only acts on response state produced by the current attempt.\nThis fixes a double-free without changing replay handling for successful\nrequests."
    }
  ],
  "lastModified": "2026-09-04T20:46:44.003",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E87EC5E7-E8A2-454C-B824-B59AD9398CF5",
              "versionEndExcluding": "6.6.145",
              "versionStartIncluding": "6.6.32"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FF057477-A6F6-4993-9DFB-969A787F9F33",
              "versionEndExcluding": "6.12.96",
              "versionStartIncluding": "6.8.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "914AE4BC-3D59-4C5A-9DB5-9CE327B429F7",
              "versionEndExcluding": "6.18.39",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42",
              "versionEndExcluding": "7.1.4",
              "versionStartIncluding": "6.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "41E47F32-BA80-4333-96FD-4D25082B0FDD"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F02056A5-B362-4370-9FF8-6F0BD384D520"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "62075ACE-B2A0-4B16-829D-B3DA5AE5CC41"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A780F817-2A77-4130-A9B7-5C25606314E3"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AEB9199B-AB8F-4877-8964-E2BA95B5F15C"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C9B8A5CE-6D20-4C36-AC01-ACA4B70003A8"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}