{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64386", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.784Z", "datePublished": "2026-07-25T08:50:34.729Z", "dateUpdated": "2026-10-19T20:38:26.574Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:54:38.353Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix query_info() replay double-free\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_query_info_init() fails before the next send,\ncleanup retains the previous buffer type and frees that response again.\n\nReset response bookkeeping before each attempt to prevent the stale free." } ], "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 - A malicious or compromised SMB2/3 server can remotely return a response-bearing replayable error and manipulate the subsequent connection state, reaching the vulnerable client over TCP.\nAC:L - The server controls the error response, disconnect, and reconnection sequence and can repeat it until the stale free occurs. Replay-enabled hard or retrans-configured SMB mounts are a reasonable deployment.\nPR:N - The malicious SMB peer needs no privileges or credentials on the client; SMB session setup authenticates the client to the server, not the attacker to the victim kernel.\nUI:N - Once the share is mounted, ordinary or automated file and metadata operations issue query-info requests, and exploitation requires no human action during the crafted response and reconnect sequence.\nS:U - The corruption and resulting impacts occur within the same Linux kernel security authority, without crossing a VM, sandbox, or IOMMU boundary.\nC:H - The double-free corrupts SMB response-buffer slab and mempool state, enabling aliased or use-after-free buffers that can be leveraged to expose kernel memory.\nI:H - Allocator freelist corruption and reuse of one buffer by concurrent SMB operations can provide attacker-controlled modification of live kernel memory and support control-flow hijacking.\nA:H - The repeated free can immediately cause allocator corruption, a BUG, kernel oops, or panic, and the malicious server can trigger the sequence repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2pdu.c" ], "versions": [ { "version": "433042a91f9373241307725b52de573933ffedbf", "lessThan": "100fb7c455fa86d248b8bd7bb9de757c192870b4", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "3c81dda84799f76b42aec598564316e2964440db", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "f1add4acb656f5a82806a1ab0e63fed3d8b1bfca", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "89234773e8348918111aa15f6922b58cf3843364", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "2a88561d66eb855813cf004a0abe648bbb17de5e", "status": "affected", "versionType": "git" }, { "version": "6.6.32", "lessThan": "6.6.145", "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/smb2pdu.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.6.32", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/100fb7c455fa86d248b8bd7bb9de757c192870b4" }, { "url": "https://git.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440db" }, { "url": "https://git.kernel.org/stable/c/f1add4acb656f5a82806a1ab0e63fed3d8b1bfca" }, { "url": "https://git.kernel.org/stable/c/89234773e8348918111aa15f6922b58cf3843364" }, { "url": "https://git.kernel.org/stable/c/2a88561d66eb855813cf004a0abe648bbb17de5e" } ], "title": "smb: client: fix query_info() replay double-free", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-64386", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:39:59.623479Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-415", "description": "CWE-415 Double Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:38:26.574Z" } } ] } }