Vulnerability-Lookup

CVE-2026-64381 (GCVE-0-2026-64381)

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

Title

smb: client: Fix next buffer leak in receive_encrypted_standard()

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receive_encrypted_standard() receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked. Move the MAX_COMPOUND check before allocating next_buffer.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/94e4f672db029414b…
https://git.kernel.org/stable/c/68fc0b6cc03ca5806…
https://git.kernel.org/stable/c/07e0ab81df1790afa…
https://git.kernel.org/stable/c/9136a08dc29328edd…
https://git.kernel.org/stable/c/67097772df7791c53…
https://git.kernel.org/stable/c/297243e365fc9fe2f…
https://git.kernel.org/stable/c/927d4805aea0a287d…
https://git.kernel.org/stable/c/1c6267a1d5cf4c73b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 94e4f672db029414b9888b5137a7559f1febf2d8 (git) Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 68fc0b6cc03ca58060c0f36454e169f5fe258974 (git) Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 07e0ab81df1790afa35732a4e8e07ff831b29008 (git) Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 9136a08dc29328edd9867f2545e73906ac9df93b (git) Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 67097772df7791c53d608f04bd31c676ccf79b83 (git) Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 297243e365fc9fe2f8e9b7dd535a65d922cd108b (git) Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 927d4805aea0a287d36dd4f826ee24d69a2afee3 (git) Affected: b24df3e30cbf48255db866720fb71f14bf9d2f39 , < 1c6267a1d5cf4c73b656f8181b310cbbb3e4767b (git)
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (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

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{
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.212",
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              "status": "unaffected",
              "version": "6.1.178",
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              "versionType": "semver"
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix next buffer leak in receive_encrypted_standard()\n\nreceive_encrypted_standard() allocates next_buffer before checking\nwhether the number of compound PDUs already reached MAX_COMPOUND. If\nthe limit check fails, the function returns immediately and the newly\nallocated next_buffer is not assigned to server-\u003esmallbuf/server-\u003ebigbuf,\nmaking it leaked.\n\nMove the MAX_COMPOUND check before allocating next_buffer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:50:31.209Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b"
        }
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      "title": "smb: client: Fix next buffer leak in receive_encrypted_standard()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64381",
    "datePublished": "2026-07-25T08:50:31.209Z",
    "dateReserved": "2026-07-19T15:36:31.784Z",
    "dateUpdated": "2026-07-25T08:50:31.209Z",
    "state": "PUBLISHED"
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      "date": "2026-07-26",
      "epss": "0.00177",
      "percentile": "0.07468"
    },
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:00:32Z",
      "cve": "CVE-2026-64381",
      "id": "CVE-2026-64381",
      "initial_release_date": "2026-07-25T16:00:32Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64381",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64381.json",
      "version": "2"
    }
  }
}

GHSA-V5FG-WC2F-7H9H

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

smb: client: Fix next buffer leak in receive_encrypted_standard()

receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked.

Move the MAX_COMPOUND check before allocating next_buffer.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64381"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:21Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix next buffer leak in receive_encrypted_standard()\n\nreceive_encrypted_standard() allocates next_buffer before checking\nwhether the number of compound PDUs already reached MAX_COMPOUND. If\nthe limit check fails, the function returns immediately and the newly\nallocated next_buffer is not assigned to server-\u003esmallbuf/server-\u003ebigbuf,\nmaking it leaked.\n\nMove the MAX_COMPOUND check before allocating next_buffer.",
  "id": "GHSA-v5fg-wc2f-7h9h",
  "modified": "2026-07-25T12:31:33Z",
  "published": "2026-07-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64381"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

CVE-2026-64381 (GCVE-0-2026-64381)

GHSA-V5FG-WC2F-7H9H

Tags

Sightings

Nomenclature