{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-35865", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.107Z", "datePublished": "2024-05-19T08:34:23.853Z", "dateUpdated": "2026-08-05T11:30:29.384Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:30:29.384Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix potential UAF in smb2_is_valid_oplock_break()\n\nSkip sessions that are being teared down (status == SES_EXITING) to\navoid UAF." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable function is invoked directly by the CIFS client's demultiplex thread on unsolicited SMB2 frames received from the remote server over TCP/445, with no signature verification and no SessionId validation on that path. A malicious/compromised SMB server or an attacker able to inject into the established TCP stream reaches it remotely.\nAC:L - The attacker controls both sides of the race: it can induce session teardown (DFS referral churn, failed session setup/tree connect, multiuser tlink expiry) and then hold the session in SES_EXITING for up to the ~180 s SMB response timeout by simply withholding the SMB2 LOGOFF reply, while flooding OPLOCK_BREAK frames into that window. The resulting window is enormous and entirely attacker-timed.\nPR:N - The remote peer needs no credentials or privileges on the victim client; the oplock-break handler runs before any MID match, signature check, or SessionId validation, so even an unauthenticated packet injector on the connection triggers it.\nUI:N - Against a client with an existing SMB mount, no victim action is required — the malicious server or MITM drives both the teardown and the oplock-break frames on its own. The mount is pre-existing system configuration, not an in-attack user action.\nS:U - The use-after-free corrupts kernel heap objects within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A use-after-free on session/tcon-reachable objects lets the attacker reclaim the freed slab object and steer the list traversal into attacker-influenced data, disclosing kernel memory and kernel pointers.\nI:H - The handler writes remote-controlled values (rsp->OplockLevel, oplock_epoch, PENDING_OPLOCK_BREAK bit) into the object it locates and then does cifsFileInfo_get() plus queue_work() on it, giving refcount-manipulation and workqueue-dispatch primitives on freed memory that are leverageable for control-flow hijack.\nA:H - Use-after-free in the demultiplex thread reliably produces kernel oops/panic, taking down the whole system even when full exploitation is not achieved." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2misc.c" ], "versions": [ { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "a710ef9e974f18232d2b9b19c90eda1a1167b2d4", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "84488466b7a69570bdbf76dd9576847ab97d54e7", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "21fed37d2bdcde33453faf61d3d4d96c355f04bd", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "3dba0e5276f131e36d6d8043191d856f49238628", "status": "affected", "versionType": "git" }, { "version": "7f48558e6489d032b1584b0cc9ac4bb11072c034", "lessThan": "22863485a4626ec6ecf297f4cc0aef709bc862e4", "status": "affected", "versionType": "git" }, { "version": "a67172a013953664b1dad03c648200c70b90506c", "status": "affected", "versionType": "git" }, { "version": "3.12.48", "lessThan": "3.13", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2misc.c" ], "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.85", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "3.13", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.1.85" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.8.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12.48" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a710ef9e974f18232d2b9b19c90eda1a1167b2d4" }, { "url": "https://git.kernel.org/stable/c/84488466b7a69570bdbf76dd9576847ab97d54e7" }, { "url": "https://git.kernel.org/stable/c/21fed37d2bdcde33453faf61d3d4d96c355f04bd" }, { "url": "https://git.kernel.org/stable/c/3dba0e5276f131e36d6d8043191d856f49238628" }, { "url": "https://git.kernel.org/stable/c/22863485a4626ec6ecf297f4cc0aef709bc862e4" } ], "title": "smb: client: fix potential UAF in smb2_is_valid_oplock_break()", "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": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-18T16:57:58.906769Z", "id": "CVE-2024-35865", "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": "2024-11-01T15:44:35.957Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T03:21:48.469Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/84488466b7a69570bdbf76dd9576847ab97d54e7", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/21fed37d2bdcde33453faf61d3d4d96c355f04bd", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3dba0e5276f131e36d6d8043191d856f49238628", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/22863485a4626ec6ecf297f4cc0aef709bc862e4", "tags": [ "x_transferred" ] } ] } ] } }