Vulnerability-Lookup

CVE-2026-89792 (GCVE-0-2026-89792)

Vulnerability from cvelistv5 – Published: 2026-09-16 08:50 – Updated: 2026-09-16 14:38

Title

ksmbd: prevent out-of-bounds reads in share config responses

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds reads in share config responses Validate IPC share configuration payload sizes before consuming variable-length fields. Bound veto list parsing and account for the separator byte when deriving the path length.

Severity

7.1 (High)


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

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/61a8d06600c8c397f…
https://git.kernel.org/stable/c/f25e93768fcc5d828…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: a677ebd8ca2f2632ccdecbad7b87641274e15aac , < 61a8d06600c8c397f9a7e01940479d4c94a82f5f (git) Affected: a677ebd8ca2f2632ccdecbad7b87641274e15aac , < f25e93768fcc5d8287e50b1ec52a42e4c276df34 (git) Affected: 88b7f1143b15b29cccb8392b4f38e75b7bb3e300 (git) Affected: 51a6c2af9d20203ddeeaf73314ba8854b38d01bd (git) Affected: a637fabac554270a851033f5ab402ecb90bc479c (git) Affected: 76af689a45aa44714b46d1a7de4ffdf851ded896 (git) Affected: 5.15.157 , < 5.16 (semver) Affected: 6.1.85 , < 6.2 (semver) Affected: 6.6.26 , < 6.7 (semver) Affected: 6.8.5 , < 6.9 (semver)	guessed
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/share_config.c",
            "fs/smb/server/transport_ipc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "lessThan": "f25e93768fcc5d8287e50b1ec52a42e4c276df34",
              "status": "affected",
              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a637fabac554270a851033f5ab402ecb90bc479c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76af689a45aa44714b46d1a7de4ffdf851ded896",
              "versionType": "git"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.157",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.85",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.26",
              "versionType": "semver"
            },
            {
              "lessThan": "6.9",
              "status": "affected",
              "version": "6.8.5",
              "versionType": "semver"
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            "fs/smb/server/transport_ipc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.9"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc2",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.15.157",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "6.1.85",
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                },
                {
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                  "versionStartIncluding": "6.6.26",
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                {
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                  "versionStartIncluding": "6.8.5",
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              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent out-of-bounds reads in share config responses\n\nValidate IPC share configuration payload sizes before consuming\nvariable-length fields. Bound veto list parsing and account for\nthe separator byte when deriving the path length."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Malformed payload_sz/veto_list_sz and unterminated veto/path bytes are consumed from a ksmbd generic-netlink SHARE_CONFIG_RESPONSE (handle_generic_event \u2192 ipc_validate_msg \u2192 share_config_request), not from SMB PDUs. A remote TREE_CONNECT only creates the pending IPC request; the attacker must be local to inject or control that response.\nAC:L - The attacker fully controls the crafted netlink length fields and can set payload_sz to 0 or omit NULs so the old checks pass. Pending handles come from a small IDA and can be brute-forced against a TREE_CONNECT the attacker also triggers; no victim timing or rare config is required.\nPR:L - handle_generic_event requires CAP_NET_ADMIN only when CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN is set; SMBD_GENL is netns-aware, has no GENL_ADMIN_PERM, and does not bind responses to ksmbd_tools_pid. That capability is Low, and builds that disable the check allow any local user to send the message.\nUI:N - The attacker sends the malformed SHARE_CONFIG_RESPONSE and can issue the matching SMB2 TREE_CONNECT themselves; no separate victim or administrator action is required once ksmbd is running.\nS:U - The out-of-bounds reads and any resulting oops remain inside the ksmbd/kernel security authority on the host. This is not a VM escape, IOMMU/DMA bypass, or other cross-boundary impact.\nC:H - With payload_sz==0 the kernel kstrndup()s up to PATH_MAX bytes past the IPC object, and parse_veto_list() uses unbounded strlen()/kstrdup() when the veto buffer lacks a NUL within veto_list_sz. Those are large kernel-heap over-reads, not a few bounded bytes.\nI:N - The defects are out-of-bounds reads (strlen, kstrndup, kstrdup) into newly allocated strings; there is no out-of-bounds write or control-flow hijack primitive. A local IPC sender can already supply a well-formed share path without this bug.\nA:H - Walking strlen() or kstrndup(..., PATH_MAX) off the end of the IPC slab into unmapped memory oopses the ksmbd worker. The attacker can repeat the crafted response against further TREE_CONNECT-triggered requests and crash the kernel at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:38:41.504Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"
        }
      ],
      "title": "ksmbd: prevent out-of-bounds reads in share config responses",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89792",
    "datePublished": "2026-09-16T08:50:06.516Z",
    "dateReserved": "2026-09-11T19:38:34.766Z",
    "dateUpdated": "2026-09-16T14:38:41.504Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89792",
      "date": "2026-09-16",
      "epss": "0.00189",
      "percentile": "0.08778"
    },
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  }
}

FKIE_CVE-2026-89792

Vulnerability from fkie_nvd - Published: 2026-09-16 09:17 - Updated: 2026-09-16 15:18

Severity

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

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/share_config.c",
            "fs/smb/server/transport_ipc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "61a8d06600c8c397f9a7e01940479d4c94a82f5f",
              "status": "affected",
              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "lessThan": "f25e93768fcc5d8287e50b1ec52a42e4c276df34",
              "status": "affected",
              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a637fabac554270a851033f5ab402ecb90bc479c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76af689a45aa44714b46d1a7de4ffdf851ded896",
              "versionType": "git"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.157",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.85",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.26",
              "versionType": "semver"
            },
            {
              "lessThan": "6.9",
              "status": "affected",
              "version": "6.8.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/share_config.c",
            "fs/smb/server/transport_ipc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "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\nksmbd: prevent out-of-bounds reads in share config responses\n\nValidate IPC share configuration payload sizes before consuming\nvariable-length fields. Bound veto list parsing and account for\nthe separator byte when deriving the path length."
    }
  ],
  "id": "CVE-2026-89792",
  "lastModified": "2026-09-16T15:18:09.387",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
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  },
  "published": "2026-09-16T09:17:10.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-5H65-JM98-J8F7

Vulnerability from github – Published: 2026-09-16 09:30 – Updated: 2026-09-16 15:30

Details

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

ksmbd: prevent out-of-bounds reads in share config responses

Validate IPC share configuration payload sizes before consuming variable-length fields. Bound veto list parsing and account for the separator byte when deriving the path length.

Severity

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89792"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T09:17:10Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent out-of-bounds reads in share config responses\n\nValidate IPC share configuration payload sizes before consuming\nvariable-length fields. Bound veto list parsing and account for\nthe separator byte when deriving the path length.",
  "id": "GHSA-5h65-jm98-j8f7",
  "modified": "2026-09-16T15:30:57Z",
  "published": "2026-09-16T09:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89792"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2026-89792 (GCVE-0-2026-89792)

FKIE_CVE-2026-89792

GHSA-5H65-JM98-J8F7

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Related by attack behaviour