CVE-2023-3867 (GCVE-0-2023-3867)
Vulnerability from cvelistv5
Published
2025-08-16 13:29
Modified
2026-08-15 12:23
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out of bounds read in smb2_sess_setup ksmbd does not consider the case of that smb2 session setup is in compound request. If this is the second payload of the compound, OOB read issue occurs while processing the first payload in the smb2_sess_setup().
References
Impacted products
Vendor Product Version
Linux Linux Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "676392184785ace61e939831e7ca44a03d438c3b",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "ef572ffa8eb44111eed2925fbb2adca78bdcbf61",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "2ba03cecb12ac7ac9e0170e251543c56832d9959",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.145",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.40",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4.5",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix out of bounds read in smb2_sess_setup\n\nksmbd does not consider the case of that smb2 session setup is\nin compound request. If this is the second payload of the compound,\nOOB read issue occurs while processing the first payload in\nthe smb2_sess_setup()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ksmbd is an in-kernel SMB server reachable over TCP/445; the bug is in smb2_sess_setup processing of network SMB2 compound PDUs, so a remote attacker can trigger it by sending crafted packets.\nAC:L - The attacker fully controls the compound request layout (e.g., ECHO then SESSION_SETUP) and the misinterpreted SecurityBufferOffset/Length bytes in the first PDU, so the OOB read is reliably triggered with no conditions outside attacker control.\nPR:N - SMB2 SESSION_SETUP is a pre-authentication path; smb2_check_user_session explicitly exempts it (and ECHO), so no credentials or prior session are required.\nUI:N - Exploitation requires only sending SMB2 packets to a reachable ksmbd instance; no victim user action is needed.\nS:U - Impact is confined to the host kernel running ksmbd (memory disclosure/crash); this is a standard kernel vulnerability, not a cross-authority escape such as guest-to-host.\nC:H - Using smb2_get_msg(request_buf) on a non-first compound SESSION_SETUP misreads attacker-influenced offset/length fields and performs an unbounded OOB read past the request buffer; SPNEGO decoding can even copy that kernel memory into mechToken, enabling substantial information disclosure.\nI:N - The vulnerability is an out-of-bounds read; the incorrect response pointer only corrupts the attacker-facing response buffer within its allocation and does not provide an arbitrary kernel write primitive.\nA:H - An attacker-controlled OOB read past the allocated request buffer into unmapped or invalid memory can oops/panic the kernel, fully denying availability of the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-15T12:23:43.208Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/676392184785ace61e939831e7ca44a03d438c3b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef572ffa8eb44111eed2925fbb2adca78bdcbf61"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ba03cecb12ac7ac9e0170e251543c56832d9959"
        },
        {
          "url": "https://git.kernel.org/stable/c/98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8"
        }
      ],
      "title": "ksmbd: fix out of bounds read in smb2_sess_setup",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-3867",
    "datePublished": "2025-08-16T13:29:51.946Z",
    "dateReserved": "2023-07-24T14:52:44.448Z",
    "dateUpdated": "2026-08-15T12:23:43.208Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.