CVE-2023-32256 (GCVE-0-2023-32256)

Vulnerability from cvelistv5 – Published: 2025-08-01 17:37 – Updated: 2026-06-29 20:26
VLAI
Title
Kernel: ksmbd race issue from smb2 close and logoff with multichannel
Summary
A flaw was found in the Linux kernel's ksmbd component. A race condition between smb2 close operation and logoff in multichannel connections could result in a use-after-free issue.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-01 19:19 UTC
CWE
  • CWE-421 - Race Condition During Access to Alternate Channel
Assigner
References
Impacted products
Vendor Product Version CPE status
Affected: 0 , < 5.15.145 (semvar)
Affected: 6.0.0 , < 6.0.* (semvar)
Affected: 6.1.0 , < 6.1.29 (semvar)
Affected: 6.2.0 , < 6.2.16 (semvar)
Affected: 6.3.0 , < 6.3.2 (semvar)
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Date Public
2023-05-17 00:00
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                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:H",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-421",
                  "description": "Race Condition During Access to Alternate Channel",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-29T20:26:13.122Z",
            "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
            "shortName": "redhat"
          },
          "references": [
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2023-32256"
            },
            {
              "name": "RHBZ#2385885",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2385885"
            },
            {
              "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abcc506a9a71976a8b4c9bf3ee6efd13229c1e19"
            },
            {
              "url": "https://www.zerodayinitiative.com/advisories/ZDI-23-704/"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2025-08-01T01:05:16.039Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2023-05-17T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Kernel: ksmbd race issue from smb2 close and logoff with multichannel",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-421: Race Condition During Access to Alternate Channel"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2023-32256",
        "datePublished": "2025-08-01T17:37:15.603Z",
        "dateReserved": "2023-05-05T10:00:07.896Z",
        "dateUpdated": "2026-06-29T20:26:13.122Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.