CVE-2023-32249

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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\u2019s 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\u2019s connected shares and open files.\nI:H - The hijacked session retains the victim\u2019s authorization for tree connects and file operations, so the attacker can create, modify, or delete data with the victim\u2019s SMB privileges.\nA:N - This is an authentication/session-isolation bug, not memory corruption; 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{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ksmbd/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ed76d3a8910be06cd4e4ba63bf6075bf903945a1", "status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "versionType": "git"}, {"lessThan": "1f0490586544455e5be698be2e6c30077b4ec461", "status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "versionType": "git"}, {"lessThan": "4a98e859c4673013385a54084e0cd865695ca072", "status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "versionType": "git"}, {"lessThan": "088131b7b01099720a528a72005ff17868705d40", "status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "versionType": "git"}, {"lessThan": "3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2", "status": "affected", "version": "f5a544e3bab78142207e0242d22442db85ba1eff", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ksmbd/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": "5.15.112", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.28", "versionType": "semver"}, {"lessThanOrEqual": "6.2.*", "status": "unaffected", "version": "6.2.15", "versionType": "semver"}, {"lessThanOrEqual": "6.3.*", "status": "unaffected", "version": "6.3.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.4", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "752E77B1-A511-429D-A6FD-B3735478239B", "versionEndExcluding": "5.15.112", "versionStartIncluding": "5.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "08F855F4-7188-4EE1-BD79-D4B6C7E2EF54", "versionEndExcluding": "6.1.28", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3844A90B-940D-46C3-8D7B-9FF63F1AFC2F", "versionEndExcluding": "6.2.15", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "38F6F330-91A0-4675-8B90-6F950471A7CC", "versionEndExcluding": "6.3.2", "versionStartIncluding": "6.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: no permitir usuarios invitados en multicanal. Este parche devuelve STATUS_NOT_SUPPORTED si la sesi\u00f3n de enlace es de invitado."}], "id": "CVE-2023-32249", "lastModified": "2026-08-15T13:17:39.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-08-16T14:15:27.123", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/088131b7b01099720a528a72005ff17868705d40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f0490586544455e5be698be2e6c30077b4ec461"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4a98e859c4673013385a54084e0cd865695ca072"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed76d3a8910be06cd4e4ba63bf6075bf903945a1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: not allow guest user on multichannel", "id": "2388957", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2388957"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-32249", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-08-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-32249\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-32249\nhttps://lore.kernel.org/linux-cve-announce/2025081653-CVE-2023-32249-7aca@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-08-21T12:59:14.824086+00:00", "updated": "2025-08-21T12:59:14.824169+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}