{"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": "2026-08-08T15:13:27.088Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-08T15:13:27.088Z"}, "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-rc1", "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-rc1"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "037511726228aaf165c7067ff2bfc88eaecdf1f3", "status": "affected", "version": "433042a91f9373241307725b52de573933ffedbf", "versionType": "git"}, {"lessThan": "0aa97edf7c347c0f54e7e60c4740574b8120c66a", "status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "versionType": "git"}, {"lessThan": "d15d83125007f673aec4323e1bbbaaffbe87ea13", "status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "versionType": "git"}, {"lessThan": "b18ed621dbfceecea5539848cddcb9272c9a61e1", "status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "versionType": "git"}, {"lessThan": "f96e1cdcb63ed3321142ff2fcdf784e32cda8fee", "status": "affected", "version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e", "versionType": "git"}, {"lessThan": "6.6.145", "status": "affected", "version": "6.6.32", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/smb2pdu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.96", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-64597", "lastModified": "2026-08-08T15:16:34.317", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-06T08:16:35.340", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}