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

Vulnerability from cvelistv5 – Published: 2026-09-16 08:50 – Updated: 2026-10-19 08:52
VLAI
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 CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 88b7f1143b15b29cccb8392b4f38e75b7bb3e300 , < df8aa4a09733c4d3974b1db32c1782b3aad3a151 (git)
Affected: 51a6c2af9d20203ddeeaf73314ba8854b38d01bd , < 0127f1c119bde40578f4d25f5d17333b4e75de8c (git)
Affected: a637fabac554270a851033f5ab402ecb90bc479c , < fd636a87161def6e35876ab7943641ce457974c8 (git)
Affected: a677ebd8ca2f2632ccdecbad7b87641274e15aac , < ffa507f5f774cb4d45136b106989ebc051361263 (git)
Affected: a677ebd8ca2f2632ccdecbad7b87641274e15aac , < cd2bcee450bc94770be56c0b896c1a1dc6838bd8 (git)
Affected: a677ebd8ca2f2632ccdecbad7b87641274e15aac , < 61a8d06600c8c397f9a7e01940479d4c94a82f5f (git)
Affected: a677ebd8ca2f2632ccdecbad7b87641274e15aac , < f25e93768fcc5d8287e50b1ec52a42e4c276df34 (git)
Affected: 76af689a45aa44714b46d1a7de4ffdf851ded896 (git)
Affected: 5.15.157 , < 5.15.222 (semver)
Affected: 6.1.85 , < 6.1.189 (semver)
Affected: 6.6.26 , < 6.6.158 (semver)
Affected: 6.8.5 , < 6.9 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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": [
            {
              "lessThan": "df8aa4a09733c4d3974b1db32c1782b3aad3a151",
              "status": "affected",
              "version": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300",
              "versionType": "git"
            },
            {
              "lessThan": "0127f1c119bde40578f4d25f5d17333b4e75de8c",
              "status": "affected",
              "version": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd",
              "versionType": "git"
            },
            {
              "lessThan": "fd636a87161def6e35876ab7943641ce457974c8",
              "status": "affected",
              "version": "a637fabac554270a851033f5ab402ecb90bc479c",
              "versionType": "git"
            },
            {
              "lessThan": "ffa507f5f774cb4d45136b106989ebc051361263",
              "status": "affected",
              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "lessThan": "cd2bcee450bc94770be56c0b896c1a1dc6838bd8",
              "status": "affected",
              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "lessThan": "61a8d06600c8c397f9a7e01940479d4c94a82f5f",
              "status": "affected",
              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "lessThan": "f25e93768fcc5d8287e50b1ec52a42e4c276df34",
              "status": "affected",
              "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76af689a45aa44714b46d1a7de4ffdf851ded896",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.222",
              "status": "affected",
              "version": "5.15.157",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.189",
              "status": "affected",
              "version": "6.1.85",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.158",
              "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": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.15.157",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "6.1.85",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "6.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "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",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.8.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-10-19T08:52:47.159Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151"
        },
        {
          "url": "https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8"
        },
        {
          "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": "2026-10-19T08:52:47.159Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89792",
      "date": "2026-10-29",
      "epss": "0.00164",
      "percentile": "0.05598"
    },
    "nvd": {
      "cve": {
        "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": "df8aa4a09733c4d3974b1db32c1782b3aad3a151",
                    "status": "affected",
                    "version": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "0127f1c119bde40578f4d25f5d17333b4e75de8c",
                    "status": "affected",
                    "version": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "fd636a87161def6e35876ab7943641ce457974c8",
                    "status": "affected",
                    "version": "a637fabac554270a851033f5ab402ecb90bc479c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "ffa507f5f774cb4d45136b106989ebc051361263",
                    "status": "affected",
                    "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "cd2bcee450bc94770be56c0b896c1a1dc6838bd8",
                    "status": "affected",
                    "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "61a8d06600c8c397f9a7e01940479d4c94a82f5f",
                    "status": "affected",
                    "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f25e93768fcc5d8287e50b1ec52a42e4c276df34",
                    "status": "affected",
                    "version": "a677ebd8ca2f2632ccdecbad7b87641274e15aac",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "76af689a45aa44714b46d1a7de4ffdf851ded896",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5.15.222",
                    "status": "affected",
                    "version": "5.15.157",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.1.189",
                    "status": "affected",
                    "version": "6.1.85",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.6.158",
                    "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": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.222",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.189",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.111",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "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": "2026-10-19T09:18:22.900",
        "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"
            }
          ]
        },
        "published": "2026-09-16T09:17:10.040",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c"
          },
          {
            "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/cd2bcee450bc94770be56c0b896c1a1dc6838bd8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T01:00:24Z",
      "cve": "CVE-2026-89792",
      "id": "CVE-2026-89792",
      "initial_release_date": "2026-09-16T15:35:36Z",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "143",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89792",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89792.json",
      "version": "6"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    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.