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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:54
VLAI
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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 , ≤ * (original_commit_for_fix)
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-08T21:26:48+00:00",
      "cve": "CVE-2026-64381",
      "id": "CVE-2026-64381",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: Fix next buffer leak in receive_encrypted_standard()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64381.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:41:01Z",
      "cve": "CVE-2026-64381",
      "id": "CVE-2026-64381",
      "initial_release_date": "2026-07-25T16:00:32Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "715",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "111",
      "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": "12"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.