{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2023-32249",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2023-05-05T10:00:07.895Z",
        "datePublished": "2025-08-16T13:25:49.645Z",
        "dateUpdated": "2026-08-05T09:09:45.862Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T09:09:45.862Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: not allow guest user on multichannel\n\nThis patch return STATUS_NOT_SUPPORTED if binding session is guest."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                        "baseScore": 9.1,
                        "baseSeverity": "CRITICAL"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - The flaw is in ksmbd (fs/ksmbd/) SMB2 SESSION_SETUP multichannel binding, reached over TCP/445 from a remote peer with no local access required.\nAC:L - The attacker fully controls the binding connection and SESSION_SETUP messages; SessionIds are sequential ida allocations and the bind path needs no race or special memory layout, so the hijack is reliably triggerable once a live session exists.\nPR:N - ZDI-23-697 and the vulnerable ntlm_authenticate path show anonymous/guest reauthentication skips credential verification during binding, so no valid SMB credentials for the target session are required.\nUI:N - Exploitation requires only attacker-sent SMB negotiate/session-setup traffic against an already-active victim session; no additional victim action is needed.\nS:U - Impact stays within the ksmbd server’s authority (hijacked SMB session and its share/file access) and does not cross a VM, kernel/user, or other security boundary.\nC:H - Successful binding attaches the attacker to an arbitrary live session via global session lookup, granting full read access to that user’s connected shares and open files.\nI:H - The hijacked session retains the victim’s authorization for tree connects and file operations, so the attacker can create, modify, or delete data with the victim’s SMB privileges.\nA:N - This is an authentication/session-isolation bug, not memory corruption; it does not cause kernel oops/panic or otherwise deny availability of the component."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ksmbd/smb2pdu.c"
                    ],
                    "versions": [
                        {
                            "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                            "lessThan": "ed76d3a8910be06cd4e4ba63bf6075bf903945a1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                            "lessThan": "1f0490586544455e5be698be2e6c30077b4ec461",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                            "lessThan": "4a98e859c4673013385a54084e0cd865695ca072",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                            "lessThan": "088131b7b01099720a528a72005ff17868705d40",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
                            "lessThan": "3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ksmbd/smb2pdu.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.112",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.28",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.2.15",
                            "lessThanOrEqual": "6.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.3.2",
                            "lessThanOrEqual": "6.3.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.4",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "5.15.112"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "6.1.28"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "6.2.15"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "6.3.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "6.4"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/ed76d3a8910be06cd4e4ba63bf6075bf903945a1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1f0490586544455e5be698be2e6c30077b4ec461"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4a98e859c4673013385a54084e0cd865695ca072"
                },
                {
                    "url": "https://git.kernel.org/stable/c/088131b7b01099720a528a72005ff17868705d40"
                },
                {
                    "url": "https://git.kernel.org/stable/c/3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2"
                }
            ],
            "title": "ksmbd: not allow guest user on multichannel",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}