{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64597", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.799Z", "datePublished": "2026-08-06T07:13:52.117Z", "dateUpdated": "2026-10-19T20:48:43.468Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:58:19.742Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix double-free in SMB2_close() replay\n\nA response-bearing attempt can return a replayable error and free its\nresponse buffer. If SMB2_close_init() fails before the next send, cleanup\nretains 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 SMB server triggers the double-free via crafted SMB2 CLOSE responses over the network, returning replayable NTSTATUS values that map to -EAGAIN/-ECONNABORTED while leaving a response buffer for the client to free.\nAC:L - The attacking server controls both sides of the sequence by returning a replayable CLOSE status with a response buffer, then dropping or forcing reconnect so SMB2_close_init fails before the next send, and can repeat until the stale free occurs.\nPR:N - The attacking SMB endpoint needs no account or privileges on the victim client; once an SMB session and handle exist, the server alone drives the vulnerable CLOSE replay path.\nUI:N - On an already mounted or automounted share, background paths such as cached-directory close and cancelled-close work, as well as routine service file closes, can invoke SMB2_close without interactive user action at exploit time.\nS:U - The mempool double-free corrupts kernel memory within the same host kernel security authority and does not inherently cross a VM, IOMMU, or sandbox boundary.\nC:H - Double-free of a CIFS small/large response buffer can create overlapping live allocations and use-after-free reads, enabling disclosure of arbitrary kernel memory.\nI:H - Reallocation of the freed mempool object with attacker-controlled network data can corrupt live kernel objects or allocator metadata, enabling arbitrary writes and control-flow hijacking.\nA:H - The duplicate free can immediately trigger allocator BUG diagnostics, heap corruption, oops, or panic, and the server can retrigger the path 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": "037511726228aaf165c7067ff2bfc88eaecdf1f3", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "0aa97edf7c347c0f54e7e60c4740574b8120c66a", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "d15d83125007f673aec4323e1bbbaaffbe87ea13", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "b18ed621dbfceecea5539848cddcb9272c9a61e1", "status": "affected", "versionType": "git" }, { "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "lessThan": "f96e1cdcb63ed3321142ff2fcdf784e32cda8fee", "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/037511726228aaf165c7067ff2bfc88eaecdf1f3" }, { "url": "https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a" }, { "url": "https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13" }, { "url": "https://git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1" }, { "url": "https://git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee" } ], "title": "smb: client: fix double-free in SMB2_close() replay", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-64597", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:43:23.981933Z" } } } ], "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": "2026-10-19T20:48:43.468Z" } } ] } }