Vulnerability-Lookup

FKIE_CVE-2026-64385

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-27 05:16

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_ioctl() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_ioctl_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0be4bc64882edaefaaee8d1e27d083643eb778e6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0be4bc64882edaefaaee8d1e27d083643eb778e6",
              "status": "affected",
              "version": "433042a91f9373241307725b52de573933ffedbf",
              "versionType": "git"
            },
            {
              "lessThan": "96fcfc8ae7359346156e492ca610e830d2649ad6",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "276c8efbc49f9303ac76d0d4deab7128581b0f3b",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "fc65ffb4ef1bf540da16b17c225ae51091e07d72",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.145",
              "status": "affected",
              "version": "6.6.32",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_ioctl() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_ioctl_init() fails before the next send, cleanup\nretains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free."
    }
  ],
  "id": "CVE-2026-64385",
  "lastModified": "2026-07-27T05:16:45.203",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-25T10:17:21.810",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0be4bc64882edaefaaee8d1e27d083643eb778e6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-64385 (GCVE-0-2026-64385)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-05 12:41

Title

smb: client: fix double-free in SMB2_ioctl() replay

Summary

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/0be4bc64882edaefa…
https://git.kernel.org/stable/c/96fcfc8ae73593461…
https://git.kernel.org/stable/c/276c8efbc49f9303a…
https://git.kernel.org/stable/c/fc65ffb4ef1bf540d…
https://git.kernel.org/stable/c/f9bbadb6c94583e3b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 433042a91f9373241307725b52de573933ffedbf , < 0be4bc64882edaefaaee8d1e27d083643eb778e6 (git) Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < 96fcfc8ae7359346156e492ca610e830d2649ad6 (git) Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < 276c8efbc49f9303ac76d0d4deab7128581b0f3b (git) Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < fc65ffb4ef1bf540da16b17c225ae51091e07d72 (git) Affected: 4f1fffa2376922f3d1d506e49c0fd445b023a28e , < f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9 (git) Affected: 6.6.32 , < 6.6.145 (semver)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0be4bc64882edaefaaee8d1e27d083643eb778e6",
              "status": "affected",
              "version": "433042a91f9373241307725b52de573933ffedbf",
              "versionType": "git"
            },
            {
              "lessThan": "96fcfc8ae7359346156e492ca610e830d2649ad6",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "276c8efbc49f9303ac76d0d4deab7128581b0f3b",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "fc65ffb4ef1bf540da16b17c225ae51091e07d72",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9",
              "status": "affected",
              "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.145",
              "status": "affected",
              "version": "6.6.32",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "6.6.32",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_ioctl() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_ioctl_init() fails before the next send, cleanup\nretains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - An attacker-controlled SMB server can deliver crafted SMB2 IOCTL responses over TCP, including through the kernel\u0027s periodic interface-query FSCTL on an existing SMB3 mount.\nAC:L - On a hard or retrans-enabled mount, the server controls replayable statuses, response contents, disconnects, reconnects, and repeated attempts, allowing it to drive both sides of the triggering sequence.\nPR:N - The malicious SMB server needs no account or privilege on the target; victim mounting authority and client authentication do not grant or require attacker-side target privileges.\nUI:N - Once the share is mounted, kernel delayed work can automatically issue the affected FSCTL when the server advertises multichannel support, requiring no user action during exploitation.\nS:U - The memory corruption compromises resources governed by the same host-kernel security authority and does not inherently cross a VM, container, or IOMMU boundary.\nC:H - The response-buffer double-free can corrupt SLUB or mempool state and create dangling or overlapping live buffers, enabling use-after-free exploitation and kernel-memory disclosure.\nI:H - Attacker-controlled network data can overwrite aliased or freed buffers and poison allocator state, supporting arbitrary writes and control-flow hijacking.\nA:H - The duplicate free can trigger an allocator BUG or corrupt kernel heap state, causing an oops, panic, or complete system crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:41:21.895Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0be4bc64882edaefaaee8d1e27d083643eb778e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6"
        },
        {
          "url": "https://git.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3b"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9"
        }
      ],
      "title": "smb: client: fix double-free in SMB2_ioctl() replay",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64385",
    "datePublished": "2026-07-25T08:50:33.997Z",
    "dateReserved": "2026-07-19T15:36:31.784Z",
    "dateUpdated": "2026-08-05T12:41:21.895Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

FKIE_CVE-2026-64385

CVE-2026-64385 (GCVE-0-2026-64385)

Tags

Sightings

Nomenclature