{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52479", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.300Z", "datePublished": "2024-02-29T05:43:11.373Z", "dateUpdated": "2026-08-15T12:23:48.733Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T12:23:48.733Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "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": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "694e13732e830cbbfedb562e57f28644927c33fd", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "8226ffc759ea59f10067b9acdf7f94bae1c69930", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "d5b0e9d3563e7e314a850e81f42b2ef6f39882f9", "status": "affected", "versionType": "git" }, { "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9", "lessThan": "c69813471a1ec081a0b9bf0c6bd7e8afd818afce", "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": "5.15.135", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.57", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.7", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "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": "5.15.135" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.5.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd" }, { "url": "https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930" }, { "url": "https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9" }, { "url": "https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce" } ], "title": "ksmbd: fix uaf in smb20_oplock_break_ack", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2025-04-22T15:51:22.969165Z", "id": "CVE-2023-52479", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-22T15:51:52.746Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T23:03:19.917Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce", "tags": [ "x_transferred" ] } ] } ] } }