{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53399", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:54:09.738Z", "datePublished": "2025-09-18T13:33:39.575Z", "dateUpdated": "2026-08-05T09:13:55.789Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:13:55.789Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix NULL pointer dereference in smb2_get_info_filesystem()\n\nIf share is , share->path is NULL and it cause NULL pointer\ndereference issue." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server; the bug is reached by sending SMB2_QUERY_INFO over TCP/445 after tree-connecting to IPC$, so a remote network peer triggers it with no local access.\nAC:L - The attacker simply tree-connects to the IPC$ pipe share and issues SMB2_QUERY_INFO with InfoType=SMB2_O_INFO_FILESYSTEM; share->path is always NULL for KSMBD_SHARE_FLAG_PIPE shares, so the NULL deref is deterministic with no race or uncontrolled precondition.\nPR:N - IPC$ is the classic SMB null-session target, and ksmbd's commonly shipped map-to-guest configuration lets an unauthenticated client obtain a guest session, tree-connect IPC$, and reach smb2_get_info_filesystem() without valid credentials.\nUI:N - The attacker drives negotiate, session setup, IPC$ tree connect, and QUERY_INFO entirely from its own SMB client; no victim or administrator action is required beyond ksmbd already listening.\nS:U - The NULL dereference oops/panic affects only the host kernel running ksmbd and does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - This is a pure NULL pointer dereference in getname_kernel()/strlen on share->path; no out-of-bounds read or other disclosure primitive is obtained.\nI:N - The fault is a read of address 0 with no memory write, type confusion, or control-flow hijack path beyond the ensuing oops.\nA:H - Dereferencing the NULL share->path causes a kernel oops/panic in the ksmbd worker (as shown by the KASAN null-ptr-deref report), which is a full availability impact that a remote attacker can repeat at will." } ] } ], "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": "227eb2689b44d0d60da3839b146983e73435924c", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "a70751dd7b60eab025e97e19b6b2477c6eaf2bbb", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "b35f6c031b87d9e51f141ff6de0ea59756a8e313", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1636e09779f83e10e6ed57d91ef94abcefdd206b", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "3ac00a2ab69b34189942afa9e862d5170cdcb018", "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": "5.15.111", "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": "5.15.111" }, { "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/227eb2689b44d0d60da3839b146983e73435924c" }, { "url": "https://git.kernel.org/stable/c/a70751dd7b60eab025e97e19b6b2477c6eaf2bbb" }, { "url": "https://git.kernel.org/stable/c/b35f6c031b87d9e51f141ff6de0ea59756a8e313" }, { "url": "https://git.kernel.org/stable/c/1636e09779f83e10e6ed57d91ef94abcefdd206b" }, { "url": "https://git.kernel.org/stable/c/3ac00a2ab69b34189942afa9e862d5170cdcb018" } ], "title": "ksmbd: fix NULL pointer dereference in smb2_get_info_filesystem()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-53399", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T19:01:07.198974Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:03:06.653Z" } } ] } }