275 lines
13 KiB
JSON
275 lines
13 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-2023-52442",
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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": "2024-02-20T12:30:33.291Z",
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"datePublished": "2024-02-21T07:21:01.814Z",
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"dateUpdated": "2026-08-05T09:09:59.894Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:09:59.894Z"
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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 session id and tree id in compound request\n\n`smb2_get_msg()` in smb2_get_ksmbd_tcon() and smb2_check_user_session()\nwill always return the first request smb2 header in a compound request.\nif `SMB2_TREE_CONNECT_HE` is the first command in compound request, will\nreturn 0, i.e. The tree id check is skipped.\nThis patch use ksmbd_req_buf_next() to get current command in compound."
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}
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],
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"metrics": [
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{
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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 reachable over TCP/445; a remote attacker triggers it by sending a crafted compound SMB2 request.\nAC:L - The attacker fully controls the compound request layout and can reliably place TREE_CONNECT (or CANCEL/LOGOFF) first so subsequent commands skip tree-id validation; no races or unpredictable conditions are required.\nPR:N - ZDI-24-227 states authentication is not required; the most severe reasonable deployment includes guest/anonymous ksmbd shares, and compound handling is reachable without verified credentials.\nUI:N - Exploitation requires only sending SMB2 packets to the ksmbd service; no victim user action is needed.\nS:U - Impact is confined to the host kernel/SMB authority (DoS and possible disclosure); this is not a VM escape, IOMMU bypass, or other cross-authority boundary change.\nC:H - ZDI classifies this as an information-disclosure vulnerability from improper chained-request validation; when uncertain between C:N (pure crash) and C:H, the higher severity is selected.\nI:N - The direct bug is skipped session/tree validation leading to NULL dereference and disclosure potential; it does not by itself provide a write or integrity-corruption primitive.\nA:H - Skipping tree validation leaves work->tcon NULL so subsequent compound commands (e.g. CREATE/OPEN) dereference NULL (tcon->share_conf), causing a kernel oops and denying service."
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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/smb2pdu.c"
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],
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"versions": [
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{
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"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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],
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"versions": [
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{
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"version": "5.15",
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"status": "affected"
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"version": "0",
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"status": "unaffected",
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"version": "5.15.145",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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{
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.4.16",
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"lessThanOrEqual": "6.4.*",
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"status": "unaffected",
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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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"references": [
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"url": "https://git.kernel.org/stable/c/becb5191d1d5fdfca0198a2e37457bbbf4fe266f"
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}
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"title": "ksmbd: validate session id and tree id in compound request",
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"type": "CWE",
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"content": {
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"timestamp": "2024-02-21T20:10:42.657502Z",
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"id": "CVE-2023-52442",
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"options": [
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