{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64383", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.784Z", "datePublished": "2026-07-25T08:50:32.634Z", "dateUpdated": "2026-10-19T20:38:26.139Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:54:35.045Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_flush() replay\n\nSMB2_flush() keeps its response buffer bookkeeping across replay\nattempts. If a replayable flush response is received and the retry then\nfails before cifs_send_recv() stores a replacement response, flush_exit\nwill free the stale response pointer a second time.\n\nReinitialize resp_buftype and rsp_iov at the top of the replay loop so\ncleanup only acts on response state produced by the current attempt.\nThis fixes a double-free without changing replay handling for successful\nrequests." } ], "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 SMB server can trigger the flaw through crafted replayable responses and connection failures over the network.\nAC:L - The server controls both the replayable error and subsequent reconnect failure, allowing repeated triggering without an uncontrollable race.\nPR:N - The attacking SMB endpoint requires no privileges on the client system once an SMB session and file handle exist.\nUI:N - An automatically mounted share and routine service-generated fsync, truncate, timestamp, or seek operations can reach SMB2_flush() without human participation.\nS:U - The memory corruption compromises resources governed by the same host kernel security authority.\nC:H - The response-buffer double-free can create overlapping CIFS slab allocations and use-after-free primitives capable of exposing arbitrary kernel memory.\nI:H - Allocator corruption and attacker-influenced overlapping network buffers can provide arbitrary-write or control-flow-hijacking primitives.\nA:H - The double-free can immediately trigger an allocator BUG, kernel oops, or panic and can be invoked 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": "6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "878757163eea684750107a31ea134c103863515d", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "3407240cde132a4b72d6429a2625a09a2f78adaf", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "013a9a3da46c5dabcf18f65ea6a47874ba12a15d", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a", "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/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb" }, { "url": "https://git.kernel.org/stable/c/878757163eea684750107a31ea134c103863515d" }, { "url": "https://git.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adaf" }, { "url": "https://git.kernel.org/stable/c/013a9a3da46c5dabcf18f65ea6a47874ba12a15d" }, { "url": "https://git.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a" } ], "title": "smb: client: fix double-free in SMB2_flush() replay", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-64383", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:39:52.688233Z" } } } ], "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": "2026-10-19T20:38:26.139Z" } } ] } }