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-2023-52479",
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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": "2024-02-20T12:30:33.300Z",
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"datePublished": "2024-02-29T05:43:11.373Z",
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"dateUpdated": "2026-08-15T12:23:48.733Z"
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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": "2026-08-15T12:23:48.733Z"
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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: fix uaf in smb20_oplock_break_ack\n\ndrop reference after use opinfo."
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}
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],
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"metrics": [
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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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 ksmbd's SMB2_OPLOCK_BREAK handler in fs/smb/server/smb2pdu.c, reached from SMB2 PDUs on the in-kernel SMB server listening on TCP/445; no local access is required.\nAC:L - The attacker fully controls the sequence—open with an exclusive/batch oplock, trigger the break from a second connection or create, then send the oplock break ack—and the success path always drops the opinfo reference before writing op_state and waking oplock_q.\nPR:L - smb2_check_user_session() rejects SMB2_OPLOCK_BREAK without a valid session, and the path also needs a tree connect plus an open handle holding an oplock, so a basic authenticated share user (or guest where permitted) is required.\nUI:N - The attacker performs every step—file open, conflicting open to force the break, and the oplock break ack—with no action by any legitimate user or administrator.\nS:U - The corruption and impact stay within the kernel/ksmbd security authority; this is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary escape.\nC:H - Use-after-free of struct oplock_info (and related fd/refcount state) lets an attacker reclaim and read the freed heap object via subsequent opinfo/conn/sess/o_fp dereferences, enabling arbitrary kernel memory disclosure.\nI:H - The freed oplock_info still participates in wait queues and list links; reclaiming it lets wake_up_interruptible_all() invoke attacker-controlled wait_queue_entry callbacks and list operations act as write primitives for code execution.\nA:H - Even without full exploitation, the use-after-free and possible double put on the pin-failure path reliably cause kernel oops/panic, and the attacker can repeat the sequence to keep the server unavailable."
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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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
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"lessThan": "694e13732e830cbbfedb562e57f28644927c33fd",
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"status": "affected",
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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/smb2pdu.c"
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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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},
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{
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"version": "0",
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"lessThan": "5.15",
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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": "5.15.135",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.57",
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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": "6.5.7",
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"lessThanOrEqual": "6.5.*",
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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": "6.6",
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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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],
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"cpeApplicability": [
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{
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"nodes": [
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd"
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},
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{
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"url": "https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930"
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{
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"url": "https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9"
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}
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],
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"title": "ksmbd: fix uaf in smb20_oplock_break_ack",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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"adp": [
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{
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{
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"descriptions": [
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{
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"type": "CWE",
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"lang": "en",
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"description": "CWE-noinfo Not enough information"
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2025-04-22T15:51:22.969165Z",
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"id": "CVE-2023-52479",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"version": "2.0.3"
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}
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"title": "CISA ADP Vulnrichment",
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