208 lines
11 KiB
JSON
208 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-4515",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2023-08-24T10:34:48.702Z",
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"datePublished": "2025-08-16T13:25:50.562Z",
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"dateUpdated": "2026-08-05T09:09:51.240Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:09:51.240Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate command request size\n\nIn commit 2b9b8f3b68ed (\"ksmbd: validate command payload size\"), except\nfor SMB2_OPLOCK_BREAK_HE command, the request size of other commands\nis not checked, it's not expected. Fix it by add check for request\nsize of other commands."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerable code is in ksmbd (fs/smb/server/), the in-kernel SMB server reached over TCP/445; a remote peer triggers it by sending a crafted SMB2 PDU that fails StructureSize2 validation.\nAC:L - An attacker fully controls StructureSize2 and the RFC1002 PDU length and can reliably send a short pre-auth SESSION_SETUP (e.g. StructureSize2=1 with pdu_size=68) that passes the incomplete check and OOBs in smb2_get_data_area_len; no race or external condition is required.\nPR:N - ksmbd_smb2_check_message runs for SMB2_NEGOTIATE, SMB2_SESSION_SETUP, and SMB2_ECHO, which smb2_check_user_session explicitly allows without a session, so the OOB is reachable before any credential verification.\nUI:N - Exploitation requires only attacker-sent SMB2 packets to a listening ksmbd instance; no victim user action is needed.\nS:U - Impact stays within the host kernel/ksmbd security authority (heap OOB read/DoS); this is not a VM escape, IOMMU bypass, or other cross-authority boundary change.\nC:H - Missing StructureSize2 matching allows slab out-of-bounds reads of fixed command fields (and subsequent use of those values as security-blob offset/length), which can disclose adjacent kernel heap contents under standard grooming; per guidance OOB reads score C:H.\nI:N - The defect is an out-of-bounds read from incomplete request-size validation; unlike related ksmbd heap overflows there is no demonstrated out-of-bounds write or direct integrity/control-flow primitive from this bug alone.\nA:H - The slab OOB read can fault under KFENCE/DEBUG_PAGEALLOC or panic under KASAN (as in the related KASAN report for the incomplete parent fix), and the attacker can retrigger it pre-authentication at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/smb2misc.c"
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],
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"versions": [
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{
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"version": "35f450f54dca1519bb24faacd0428db09f89a11f",
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"status": "affected",
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"versionType": "git"
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"versionType": "git"
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{
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"status": "affected",
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"versionType": "git"
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{
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"version": "5.15.121",
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"lessThan": "5.15.127",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.36",
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"lessThan": "6.1.46",
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"status": "affected",
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},
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{
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"version": "6.3.10",
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"lessThan": "6.4",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/server/smb2misc.c"
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],
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"versions": [
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{
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"version": "6.4",
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{
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"version": "0",
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"status": "unaffected",
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},
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{
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"version": "5.15.127",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.46",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.4.11",
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"lessThanOrEqual": "6.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.5",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"cpeApplicability": [
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/595679098bdcdbfbba91ebe07a2f7f208df93870"
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},
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{
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"url": "https://git.kernel.org/stable/c/c6bef3bc30fd4a175aef846b7d928a6c40d091cd"
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},
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{
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"url": "https://git.kernel.org/stable/c/ff7236b66d69582f90cf5616e63cfc3dc18142bb"
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{
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"url": "https://git.kernel.org/stable/c/5aa4fda5aa9c2a5a7bac67b4a12b089ab81fee3c"
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}
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],
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"title": "ksmbd: validate command request size",
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