{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-4130", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2023-08-03T08:12:08.227Z", "datePublished": "2025-08-16T13:27:58.227Z", "dateUpdated": "2026-08-05T09:09:50.170Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:09:50.170Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()\n\nThere are multiple smb2_ea_info buffers in FILE_FULL_EA_INFORMATION request\nfrom client. ksmbd find next smb2_ea_info using ->NextEntryOffset of\ncurrent smb2_ea_info. ksmbd need to validate buffer length Before\naccessing the next ea. ksmbd should check buffer length using buf_len,\nnot next variable. next is the start offset of current ea that got from\nprevious ea." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in ksmbd's in-kernel SMB server (fs/smb/server/smb2pdu.c) and is reached over TCP/445 via SMB2_SET_INFO FILE_FULL_EA_INFORMATION or SMB2_CREATE with an EA create context; a remote client triggers it with crafted EA buffers.\nAC:L - The attacker fully controls NextEntryOffset, EaNameLength, and EaValueLength in the EA list and can deterministically advance past the validated region so subsequent entries are parsed with an incorrect remaining-length check; no race or attacker-uncontrollable precondition is required.\nPR:L - smb2_set_ea() is reached only after SMB2 session setup and tree connect: SET_INFO needs a writable handle with FILE_WRITE_EA, and CREATE-with-EA needs share write access, so an ordinary authenticated SMB account (or guest on guest-enabled shares) suffices, but this is not a pre-authentication path.\nUI:N - The attacker completes negotiate, session setup, tree connect, and the crafted SET_INFO/CREATE sequence entirely from its own connection; no local user or administrator action is required.\nS:U - The out-of-bounds read, optional xattr exfiltration, and any oops occur within the host kernel/ksmbd security authority; this is not a VM escape, IOMMU bypass, or sandbox boundary cross.\nC:H - After advancing via NextEntryOffset, the wrong check validates against next instead of remaining buf_len, so EaNameLength/EaValueLength can drive unbounded out-of-bounds reads of adjacent kernel heap; setxattr can persist that memory into an EA the attacker later queries, so the over-read is not limited to a few bytes.\nI:N - The defect is a read past the request buffer into name/value parsing and setxattr source data; there is no out-of-bounds write, type confusion, or control-flow hijack primitive from this bug alone (ZDI classifies it as information disclosure).\nA:H - Reading past the kmalloc'd request buffer can fault into unmapped memory and oops/panic the kernel, and the attacker can retrigger the malformed EA list on each SET_INFO or CREATE." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/smb2pdu.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "aeb974907642be095e38ecb1a400ca583958b2b0", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "f339d76a3a972601d0738b881b099d49ebbdc3a2", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "4bf629262f9118ee91b1c3a518ebf2b3bcb22180", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "79ed288cef201f1f212dfb934bcaac75572fb8f6", "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/smb/server/smb2pdu.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.127", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.46", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.11", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "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": "5.15.127" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.4.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/aeb974907642be095e38ecb1a400ca583958b2b0" }, { "url": "https://git.kernel.org/stable/c/f339d76a3a972601d0738b881b099d49ebbdc3a2" }, { "url": "https://git.kernel.org/stable/c/4bf629262f9118ee91b1c3a518ebf2b3bcb22180" }, { "url": "https://git.kernel.org/stable/c/79ed288cef201f1f212dfb934bcaac75572fb8f6" } ], "title": "ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()", "x_generator": { "engine": "bippy-1.2.0" } } } }